sevensnight

2025年3月12日

摘要：题目: from Crypto.Util.number import * from secret import FLAG p = getPrime(128) step = len(FLAG) // 3 xs = [bytes_to_long(FLAG[:step]), bytes_to_long(F 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(31) 评论(0) 推荐(0)

二元LCG

摘要：题目: from secret import flag assert flag[:5] == b'cazy{' assert flag[-1:] == b'}' flag = flag[5:-1] assert (len(flag) == 24) class my_LCG: def __init__ 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(33) 评论(0) 推荐(0)

LCG隔位输出(多次连续加密)

摘要：题目: from Crypto.Util.number import * flag = b'NSSCTF{******}' class LCG: def __init__(self, seed, a, b, m): self.seed = seed # 初始种子 self.a = a # 乘数 se 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(36) 评论(0) 推荐(0)

LCG变体

摘要：题目: from Crypto.Util.number import * flag = b'NSSCTF{******}' class LCG: def __init__(self, seed, a, b, m): self.seed = seed # 初始种子 self.a = a # 乘数 se 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(39) 评论(0) 推荐(0)

已知output(被混淆)

摘要：题目: from Crypto.Util.number import getPrime from random import choice, randint # flag来源 flag = b"VNCTF{xxxxxxx}" assert len(flag)<100 FLAG1=flag[:32] 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(28) 评论(0) 推荐(1)

已知output(逆元不出来)

摘要：题目: from Crypto.Util.number import * flag = b'NSSCTF{******}' class LCG: def __init__(self, seed, a, b, m): self.seed = seed # 初始种子 self.a = a # 乘数 se 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(11) 评论(0) 推荐(0)

已知output

摘要：题目: from Crypto.Util.number import * flag = b'Spirit{****************************************}' plaintext = bytes_to_long(flag) length = plaintext.bit 阅读全文

posted @ 2025-03-12 00:03 sevensnight 阅读(21) 评论(0) 推荐(0)

已知n,output

摘要：题目: from Crypto.Util.number import * flag = b'Spirit{********************************}' plaintext = bytes_to_long(flag) length = plaintext.bit_length( 阅读全文

posted @ 2025-03-12 00:02 sevensnight 阅读(32) 评论(0) 推荐(0)

已知a,n,output[n],output[n+1]

摘要：题目: from Crypto.Util.number import * flag = b'Spirit{*********************}' plaintext = bytes_to_long(flag) length = plaintext.bit_length() a = getPr 阅读全文

posted @ 2025-03-12 00:02 sevensnight 阅读(9) 评论(0) 推荐(0)

已知a,n,output[i],求b

摘要：题目: from Crypto.Util.number import * flag = b'NSSCTF{******}' class LCG: def __init__(self, seed, a, b, n): self.seed = seed # 初始种子 self.a = a # 乘数 se 阅读全文

posted @ 2025-03-12 00:02 sevensnight 阅读(10) 评论(0) 推荐(0)

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