2020/11/29-A-关于DES浅谈
数据加密算法(Data Encryption Algorithm,DEA)是一种对称加密算法,很可能是使用最广泛的密钥系统,特别是在保护金融数据的安全中,最初开发的DEA是嵌入硬件中的。DES 使用 16 个循环,使用异或,置换,代换,移位操作四种基本运算。 类似于:A1ez8zw/wJ4Gv81u4sqcmLnelJMtRxkzud2kVbgPHzyRODR7Y6AxCkI3Wuk02EXadJKeKFXhvRtNtorZCix7N1DEzACVCXmhN7oq2OBa8ujBuyyNgXmPTAUZDmbl2ULFE2XzOv359pjIFRTCiQT7iCMveX0I0lsH0BKuAC0QNCE3ZJTtRVodIPPwSWL647inTpHCqtOhrdXFs7A9wvfd7tXqJQtFG7HMKjFJC3YI+ln9pjTetZ9NSF6Jr0sXPj27HD+JA+CFJlk0X3y5HJezgfafCic8ES2kcakwr/ryupUZRqYR84D8jT0oqcu+bcDNJiK6w2cBnagp884q9i3Cpt+yTMV6GJDTIu+ewBlA7UaNoVkOSoESrsDHWX/2eZTRCL+7bQSmzJ8fn1RwHT78YC+Rp4W6ij8+opzxO+A76rC+Yu7z7peYazAteYt3H82HO6yF3fs2TK5+UP4VtDjNXag2Ni/JUXWXt9B786AS84YutdittyP6Iat5uJlcoqxdY9thnBVdDzbvW1aZAQYjNWcPYVx1t9qSC/rUyhwctGfFVz9Mrp2J4jX73z25cvBb6ieEfFJedg3ZNziymPbv0JaNXlCi37AbVRyUTaK/ASdIl7zOmjjdUf313gk9alI39OqAJ259c/1dB8IBM+pRzQHlsswl3uct98LBviUCrTibqO1qfEcyFr4yE874/JXuOfPFaGHoV4jThVZ5XWIwWK33vRZjpX7M0xqIvgyEPW38wgJkAm+hXqLIXHrgdmjbo9Mhlqj2lwA2cmj30RgfqaUe69VHz1GWdYJEPiupAvyVvMIrS9TH9Xf2ds63VPoyBwZtn9xEsMpePLT/m2ow6B2DbZXJcTTc0d9bRvZ1Vv5QjgWngrkZaQKroVT+F1YnlS5qhkUw7ENx3XJXjqpHI0xqYAIomL4ds769s8TgudbgcHZ9wg7afq81kdivlORgLZV4qCqD2F7jDwft1RYIQPUYZYbollX8W/Aio2kNhEqYRIgYMoTNFGBvZPbKRhlZU/nlA9rlB0o6HbcKD+dyXwuYnSY1cjddGPdtMhyIpHdh51UNSkfP/RQYt4IJ6T6z9qdtNYlxJzIDfBPaelS02rrOy0BLTw13VkCbuZcZTx6JPWdP2Zh4OPc1e2WW9V18St6DWVaAotI0LKVSfS38pFT/R1tHNTsSVYh1eKV/cczEwKL+QMJ71l6tVImB2V2exX1XJaFI2cLAUHK6dzx3qatnVGhSctfX/p7VYpgbWbDbX+MW90PAgnNj55RU9KSKlabnmgDRuTZ7UF6VdZHo6Ohnd6khWqB551sd4r9iDIP0jdXPwH95pnTrqe6OrmdNjMWZSQZ5VoAWe4m/2144JDXzjzSC8K33UbCEiHGYtQ22kG8L4AXJMFTi0+I9+E4L+3zEkPGBVfz9LKYZ/31hbpVZCSiTpHCoty2wpDbZ6toKiKecXDUFNCi//hgLVIaoWBtHwS0ED6dAUtZo/W0li874+ApNnVcC1NNo/8cLbsz15zpxFsT7FmVPbCqQVp4QZlQjhmcnOKAfD90OCEHfoIT64wdoiL5hfvqe/MDVCGSEyvoCR/B4nfp8ii6JTSKUXO3EsRQHv37VmGhTa9v+zxZClQEV9X1cCq/M/QafbmYEyufMY14aQgo0tOMOOBOv02JsAUKCGVXhCl2jQ1/NdtosOhMID4tVygVEP+VDAP2CwM0B651omajfldkk78IhXx87wfewPvYkKGRiKpL+OS4lH01YIlRbdB6rWoPpBTtNbgG3t+c4puKy2+RRQIKyOO40t7rGQiM/IPG/DtDCu0J2ANz2zWz1oV8zeKKT6SF7D/kr7973lRw7DfAC+mSa6dJHgPt2sSv/t8HhSnxEHLoKmhZ0kUCf0ViWKKWRhrpBe/cXJuRrLohv17+nsJnWT9m36BkzEN+P/MS2Ezd4EMX0t1jxbaqJPoa9uvgahVaa2C+UlgYEQ+Yf+gKCIzukbIWEZy/chi1cfYMGzmHdpRu4eam7kEhibT1Dh29+RzGYrnn1Xzbd4BAvdh3mdrdGL56bGBYfgFQoz6WBZEbemgJ/fmrTX5unR60L4n7YDCohT78dQowVQmuU5Yv+cRc50CiIlYPW6bDCX8NPEhV4WfbK9hsOjTnLA8dpVkyXHRUbIwTSFzz8Lh0Og7gcAhUJQ64gzrOy7oxdHsATPRaQ/4HRPtRY64yJzm1bsI1rprkrYFMRRUzxikx+A/XEmSfeEA+fAN1bZZZluZ0AioF8eq0qFvF6/ap94aCvgJFsFfbZmEZ8adxY1muX6zABvkV+YbZ+sdmhXTCgRRZFjgVEpUGvaJhntOmzL/eeGS5CD9RF6IySHkcPH3YYa8G40S0m1kfVjmhUami4MiIT9F4gJrSuAgLSNZrSrOq+LZxAf3IjqNQUNRA65erOL70OzYhIUsevNi1K6jr422WcEU5gKUt9BFqpbL17fRY/1fxVneFuWR+Mst341zBD+dk4FTKxLEcoCjkF+OpSzlIoTAaUnOcewxkS6hbn45zDUZvzrI1jWcwxaSDR5+CzqOvzGz1sQoT0Sy8zEKgZjy5mOBM2nozvlr+No1Vlf7Y8+0S+Jq7MAywCf3BHj6qfYjYCG0/9i52Ne5BKqYqcOEnxBs8jp48OIWKd97ash36B61eqfUXZ9jTBPuLqBG8DUTsrBdBufUnFjp1cWNAz8unVQD6FMnw+8kgKQZJ03OSSkK3tKNpP2M0WqZJciy7tH2ItA82n1gt5Ggn647If/IVIZcNTp3Zvv4Lq9qJoWWXJ4ztJpPV1eRNE+VjyfXAxqg+LFlN5RaySFfAjqZPp/UjHd54Gag+COprKVpOznSUrc09W8z0eOpdTkxjhtHMm7SNvinUOKmKBu5ip12AoBzo5PiVQBir9Rc7O7kFs66NtZe2o8Yr7itV365vHE9WOxc5E0uH5/FlhT2B71XcljP+uJ7p1lIR40uEWg5KNbe3EdLEaNZSy7jeucDvchU1ydb48UBBhX/WFVMu6ltCwgIPxswkVx3Km/ZcJEtMj3W5ROdfENf6KJkPIDqRrXw3rgD/QrnzvCTWweCAAckmPIV6EyOeRvw3/ZF/9oLHKpDOlQDc0QprQB8xeGCA3QsObq7YbfUVmbzRPh5sq8Xt7IA/H8ycUa+YAHcmEZKKx+hPsIPh4jpabyyfyYiWeYTlNQePWQm+bPYmTn4A0Zwu2lNt76w1XiJsiEtL0jvkOr8v9xlaEQpVJzv/jKwzgcxLfkncuSRwiu/aKne8w7JzMSzuG4jq0ull0Sdjjd5GMIsWUEDAhAICm0g0swTwhd3p1Xp0OKTFfNezGFVYoTgF/UceBSIJPZxGb2pXTpXSZgKqsOCY87LX5v0qMLUqEgaUi5/1M6tVacMJA6sLBKxN6czjZITUSCAZwtXEqgRVzJ9yEsYRQJ61EoIYu8UTPifD58VABeMb1r3zJJlyt8omAHLHY+hs+n+j9182DrS5G1UH31ruQuuQppEeGlmRJzyjk2del4k7omYNiIPIeSUQwOeBP0E6O7cKR+VJZve/7BPq85LiGWzIXBGMX5tB+6ZxamlodT8vOAhJB0wQjHnm38y1Ge670lF5rDb/1icJSW5UE7WF5pSHHUwNTQFZtoZopQI7McXH8zkM0fauHeDHQuIoqFGyXrL0TUwri6zy1aoxf+6UWzxKiBJstV+x2sXoMNXuXPVq2MSkRffh8N/lqJWvf5QSeYzpK/zqSYO2aBOk7C7YCySJ2aUSr44FtbuR3iYbBdbjbZJWNoyx80jaui5gV1FCx6wA2dUswKhCDesTf5PrlpU+8YwiK8QE9e9Wk9gHA8Un+8mE388FdWszTD3XRHjPyBpLD6k927a+TKvTmYJo0art4GltWmVnzYyO+wlIy7gaLc0+mETPXjjSO+2hXwrh3KjxqBQqclwtxGtLCF0Sl3KkcwVtUfBLuwOI40OZyTN5V/segZp1AAnVv1KbJtTMCbD3spfbquwZmn6dz+tTp6tcPXI6IkJx7k4S5n6qysNkVKChoX5VcsBIWPVuE2WY6yp03idvlNXMO1tLR2oWckZ27b5ulHFjDBmq1se0IsylmALm03knJ7IBsjUbiwd+Zg8JR042IxrCsPRdSkFHlMBAb9lV14g6Qswf/frPalULjf6ejGw6u1Ucr+KijjsX8rel3KS3yUGBHHVJusZogjxv550uzg5Hxvi+IK+j0YQtyeexGlY4CLhujEn2Dk9DYUsQuXr7res7n+IpdOBz+BKFIl+iguvhXPiTnGecSwyUkLIg4WT5D2S5+7/LBGF4lJtqyqa1APEqGFmBfTqYYNuZ2IDhKzNMPa4bAB7Z5OqWAy+ORxNxnbkjb+J1h+hnd8koZZka+AGx7SkkLN3ddT8ywQo8N52GKI/glXHM1L4Cew+GkVr1HAyTGrJqJJ1EEtBOaja97GKyL+bn2MHwo5vLuh5meUJALwMKkcJ+gcFUOAreET0sckFw9z2tsYISLT9or38v4ejFp1K0eUuaiiLqtmEONa+5mdkql+QjI2kwKKPgsLZiUKnJVSo4y7GCIx8Co6mFxUaruKzuew6VB3dxLqGqjOo2/xfdzpmgytRBHVxIiE826ZmCj2KYYvigY36sktlihja2gm/dVdTzMA+UhF3LXC9n/07n3Y8uQ0UHbTo9g4hkhdBotgOmxfvTU49WB9oswzJ4Z/yRth9kHSxQUjs9ltXXzW7j7IVCN3+SwY9TfK9YAG+L1MSNmbj6uHJDBm/+y0vvpbHBC5xGQbCEWir2rKVzw1dYS0o74ZoACshoF1Jvm2qFq9XMDKIIIwlg6aJ7kSbLzCz5HBCDffUItE3QvLMT6JIlA/KpDXpiikwbMlBYVZrHNg4ZMWJ3jY3yR0dqFtylntfCdDx79yFXXzzEiQEw6z3/4o8YHFqwAv1SkfIt/8Rx7l9Qh3R/2ic6wuKI7/CtwSVDXJuEkya/x+XsRQz1cjwUTZ71y/yeYj2XtZ5k94k+EyXzwzPvvRbJ1VXc+ZyLGY/VIC1Y1g8NLwWWk2P/mZ6ez7PP6GPOySQqSPrT/ikKClVhC56VNy89vCQ4Aihs5ldM6zqg1ilaJ8vR+Ujung9kBH8F2urk5cqgbRTo8i8JxlmSPp+YSlvoHe8eV5pPnF2fFfpfx/zM/CsCA+ZmjS5Qw9aAERBlbEKoq40dakGG8oxCRL/AoB/nkjGd5h7HALoriaoyRUqYpmVxRUWqumnVh4TSs0fz0tm/KX3QWOSTQ7yZM/YNWuAibtjkPLe1yco8E1STMd08bN7rSEbo9m3uaObEQEw2miDl7b2CsmRFZ9dizqzv4Ta2+Tt5Ss0mJhwNTNH14e0BAeLoIb7BNQ6OWY3X8qXbkE8fbwYlXl1F3EATy/rA4PwiDdwOd7wDs3ZlS7Kd5EchTwOON2WI1WG3Hnoj0/RCqndqi+eHdNX2RDicHM08xMZLBy8A4ZD1bfe7rlIRUmDgQt+ejRhHTDhK86EpbcT2PBnbubDsNzAkHrG3jgH4nLwA9Sg6nYK56Xuo6dQk7H/F0AnPVakNK3Q/fdaCY+tH/RGqxvY86UBRF5B6AcT0wbnqIWFCCDHplEwI8j6O3sRykOnebVV6nsndsctsSElhKLZJvf5l5Wl/UiSJTfVY74FXXt9Rl7KGgefBAF6upoIapsvZebiUyGTSIUxAWE6MYcpx76j3vme/rExVLwy8WOumeZQ+TbBhsvArZhvVMzwg2Vhc1uN2ZyHkQSaZP9vqYphFkgxjZJB26YK9WqJ/CvR4SltBUtN+Olx0/jqFUf3PEkOTusI9nUkpDQMTrNk+lg9AfTvV0EXUZQuIxY/JArk2gjyS23U7alvPlyKvsbtBMTrqmDbVUiMt2gUDFJTTg5wgW4vm64cBoo2yGjfdTDHAHhVW1rErlzvZL11eCrAsKesKYONAx+3Rk14QAi4bR4sBI1B1nrA5NBXW41esHXkUNgvtIk4Ms4TqqU5del9zQkExl8FjbqBoaH6QgG/pjYtj2ORYmR6+pHlPv7+ZzoLhOUnntamJTgBfTS0qUdxiisAbrATIqaRoODuiE8yoVVSRW5rNWQkFFrv3dIQd3wQvKz0sbkcuE3CBoJ/UVPXT0MJ2SNvnM0AEXA9hPns/kqKVpsELY/4x4aBMcx9GXQtrPOM478kcd1HkWM8ioPfUduDNC0/1JcOuZDfzvAafJNcgdKUUefsFaJ5DkvrhSMv7BDChoasn+voNh4Zcx0SnE03x7/xBgehHajcRykL4nzigXVz6nhRFA1VA881mFngXnZWabWAspqyudz+NdzivqO/takXKB0x/nkngshfSokfWATdddtEYbJSA54/dN61lPinJj2khKasauMl1iGYKFwEqEygpEOw==当然,这些都是base64编码。那么,什么是base64呢? Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一,大家可以查看RFC2045~RFC2049,上面有MIME的详细规范。Base64编码可用于在HTTP环境下传递较长的标识信息。例如,在Java Persistence系统Hibernate中,就采用了Base64来将一个较长的唯一标识符(一般为128-bit的UUID)编码为一个字符串,用作HTTP表单和HTTP GET URL中的参数。在其他应用程序中,也常常需要把二进制数据编码为适合放在URL(包括隐藏表单域)中的形式。此时,采用Base64编码不仅比较简短,同时也具有不可读性,即所编码的数据不会被人用肉眼所直接看到。 比如,编写一个“123”,得出的结果就是“MTIz”。
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