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/wJ6QNPeMblfS+S1KJJ7l92/lraZM+Ee+NCMUkE7V2/pq0lCoqSrQ4+U8OX5dUd/7SGf+SQcOUynD9w4G/Kj1cgznPBsRS7pHTPdFH48DWIkxFv8kIld9lDgAENmBoWPVenI/V0n5ARptj82cgrstYXkYKqJt6X9nZ4MpZ1nh+0Ad3ejMuzgT5g+MV3YShtV99ibtQ8ixnOePkfKE+Yj1UXHYk//Yue0Ul32jXQ91Uqr7RS2MIU05Jav6rYs8RHdUeM/sFq9HsmjfH5ZBUzAnH9dJFNQHsJd0y7WZzRk6ddQqkduArREwQNR8fPhb5JUHYSH/A04zy+sIYr0JW4Fe/XN+o90F6WmRE/+dwtZPXzBJcrXsm0D6fK5F6zOEsl0i7yUE1fm68QP+j15nRTv31Dq5QpzsS3rAw7NsnBw4NKrz2d9xdRSVRm4chZCXPnRAHCIyuGfQzAIhfDmqVjNSNDuXpAGZkHIDmMHGOj4kDTsXtIjjOmL+vGd3h6yMystVfp9Cre9bNpmJ2oqPjctPS+Pxo6OpWabHzE6xj/m4Ard2HxeybVHPBx4SDW1vynBag3tqlxp1cvqM2sP2StsZFEItHy2voGmz7I661VlhGEHkCxy9Dg5dQ285eZTP/OwrD6kuv/FmeS2JjaZammr4UxjAL4fOxvbcF5xpEIV95xBB+KfIM2dafwntvDRNke5zUMEYc9s2GR3qRnMsttUXWqqT4LxDFc5yP0Oe5XH+tsqzxSk87cMqZ+F6o51v9fmLiVnbTSGOBOAlAwa7yRCGdiwgh25Xp6pqPm2ixXLgMi1GrisaMcC8+2pNmFoa86P/EqAWEjbX8lQ+xlhre3mUyGQyFUcBEA2lVadpyBif3bSBBDTlkb26Q9a2/L7bRJSCcCQrkzMvUvR2jQ8F7gyrwkXWSt3WCUgGXQ0gFyUEvu7B26Z/9BPpMsBM2YgrQz4BkqguwhBiTsgtVmwc6rKz5drlSMiG27U9+xWU/3oR6/Qi+dvxuN0qkOf1Ga/hc9Mbj1rxJqNMKz3MkrVnfBuiazipw4f5Ljb8oM4Lr2nKnYUFZ61dZRCsc7VJBuD1enzwkIaeAXWQGm8jYnhK5r8t+uVwhEdIR9Ft5gSeuhsopDNykbxbA/ZeIRvX5j7g4ny+/4U9bmQ/kteaf4T+6mzG5+O1iVDC9u5q7YYi9R9o0+N105EJToqB91Zb53HFC6ViSCevNLxBwBUNyiLHomWWjnKKx0bp+2Hb1/sF8uoPgmJEm2uiTDQrAAWT5Dam5ChHCs5uhnmkbVIIMf23XcakwDnGlHO8YNDIoxtA///fAUWP/eN59gZBDYBW3HSNuQAaT1LQHGCzYxjdoRjvaZ3Quz1hXTqs9vt/V8rq2hIDjO75m36o9eL1dmPTtdMGfldvlkXbY6No6qGSFf+reHFo14BMnBR4QwOVDD5u6gC9FSRhZgLnEFuGZPvqf2KMzn650aalc4iTuVd9l8BtS5FypmFygpr665jVlwrzJwW4yqe+Cp/fjY/hzihcra4qwwMyPegWM0zd3ODRdbQLgFzNUyT5n1FbSbRxyIxInJadvOG689cazuuVkmQTBqnUkTNBRxg/RAJIDYX4GKCEmc+g4NZkoxtKrz9riyKpwgFwOU/a5Kpiegmh5NQMxpa99crg3YhhGvzot+D8TxWxdl53jO8Jq4gqgIKtdlSpQjWVPygJE4w6DKS+U7SbAuiYW63YR6wtkl2XwXfBpIkeSFJrIP8XnLGd4+71NR5rOplendCLkHyRFxL4t63+Akourxu8lzETrKEFreRb+VLaxoU24bHj/q8tkxjrLkcibOWOGcWfkWdtJ6CTAyqx017l3XHSsgy3oPFFMR/6rTBsDrllXS/tqBgmqJjBNZSZHhKDp87h2fFZIUeEZY/55dVrbKbbFcSz+xwomvq2t18NnJMnVMbbIC+aGsQhw5zvThJzhPO2LNTU6zk8svtp5DiGheCD3ZfvK3yPSAUnC0zAosLpG1Lirpyiwwj7RCnaYG/vpXeh9UgHL4dqz4wFUNua+3OP25PRnqGbGseWhEG0e9RmLcuOk7X/TIUBwcAV9IhI05pze2xG7Ll9pmmTSULB9VpbNXwnZM3T6FXobt8HCOWDnUgkR6DLcJbwnynFOKIGLjJwcp5l90rAkYZaygRUeOBitvfAeAoJNpEaenMc6F1fOxLIO0IomHI2e37P9jorQaPi/gAKrPy9+PrzgRxtkI4ED6a1cZf4AHKXtMEdwP4IJef0AW83THKVSyU8LomFtrajaAomUEhRrxmEyRztmHsje/0FJGu6XGeV0VmE0FqZhnmh0109tcbbHXp6AFd4pbpMX37uUYzjityPAd76Suh9xpwpVkBoJuLKIdyBsdSZLeNbbv5WlugLh5vjCoxD2sWau1ozFgd7am/ZGjhqs7g692rfM2jMeVkTLwmP1+ovWZj48Ji4U4ad0u4dGdooHBY94N25J+BVkZhvjRyDFnCkvVL59Z7uQwX76hyfbZkBQCfdQcTQLptlBWv1Lb/nfOf9KE9+a5zdYuJyzLjIfEuk18pMpDWDt5+Fpo29kfuoY79erXXLq14rmxVLB2DC6lS0fqc7Y0cDb76ZVLXhVIddDgib52P3L4sCNP3+Wx2ww7pW+LXGDce1PtQHf+iullI5T+t1PI2GfLsnwa41M0aRLyfqeh1MQCSxclTU+qPU74HxIUBmbvJenG55aXJBTFK6wZAEZX+eFY8Pqz+Lyw8yN0rJML+qAgU6qazChcFIS0Cc84RrgIUtqbzfimyOnd+Hb59Cnb53ldelHgj2Uc6BUJ1LyMlmfa8nIdriO+6q5huD/dyw2XkRFTsu5jBfK7WrHBZbWFUG+JxM4z44SvmlMMDKlHyb6dQLhcjyeyyc4cOwL8HPgRQJixMHKfegtzHSGvcpK0M2smyLfmTL1m6/qje9AUHIj6FiMWxtBBmMTladgusjTN3onpswV2c5uU+/L01OtmZWCbv7+TVrEUEEtpwB8qJmj3mYLOduv+cWrkjB1C0wE/95oSnBZMM2bHBg591Hs0L0TKXrgGO3W0+43IPGIfy9AYn74NsVQ4Zt/zgpDhWnOLPBmXUjVxmuzrE6JOS13bpVAT03EyLiLuvoQsP2boQcjW3JjuUWoBrVYgWAo1r8yu/7mOQdBdpEW4OV0sXS7TexP1gphHg0mKJt0STSUsK5cK65dSogbDVg1yvIxzi1kaQFvi9RY/qQh+ETdvM1xIsQOKWPNkon8o6YOOeunZvvNxVz1McR6fvWzaZ+EX9Rxn3sxNMncLpOurvWF8KuQq8l7n9aOH2Jie19n4qanOq71jeKm+FkTMjOl4p9ppgc+zuycb/FEDHLcDP1F94ZqP6I+r8GajzXty8G1aJVTKhZ7562fBK/pmTnE4ju8aw/v7gEshqLYmWT1PX5x6Z+Z9BeXQyMvWnLRWA3wyl5fyT6rPUpqnccm9bzJi1D5tLUpP6g3JzypuHCjEQdi5owS+v0QppmAD7yoN69QYvLxh0I3ArTCTlo+txUdP6bmmsfNaJBLeoFekBRNW5aB4f8JqHfCjBMPytAjc2l9Kp+RKwL6YODZQ0+JR0ATGzSMSyxzKScmINTbZGyYxKePlkCVbCJl2pYW4cMP509R3nrz8NakJc90UAUhOIhgDLuQVvptrAQRFyNN2vX9xoMRGe2zO8VgMa/ijYkSbL2zVLDExHQjgJbxUooDXYRZfoSC+QAR87ygDisZ0vRDk/wfvor8o05mps/RKfaMcR4OTDgAkglVgdsjVu7TeANmzKNA+GclpsbtwODz3INPyhl/ePxHWvumJHR6PY9EATsN+DOOXnXNLVL8YX7HBMsrztwKAu2E60tMWrVYvyEfJzzlPsH635fcpL7LxXOS1ai47jMYSjXhFfYW1yNewl+KO5cD/RDnQiHoApBJLObspxlNpMgwN5BefLgxeK4Q4M5ZSj6U7brO24FzABXVCrVAMYYpLY+PDry0rIXD+KOVkmbhlWHDysixK2+pDIA0MUyOYO1o4aVX63Bvmf1DuztD34l7WQWIft6tQweKA+mWtxZS8JV2mmGTFwD1/ckwY1OG78uWvdYfgoTucxORfH8y0o6UHGoL2RPGO2y+A6fwA+/Hhfzbg3mZxEU+h8aUnGYGSYnp1eUnkeAl68rL6OzCGG73XLv0sji+KVRCuy5dfXVi6RnB2pB+tzYXJFCPS1wd4FIuQduVvfGtL/kX1bv/rObY8i56bV5ZCMlV+EIUPnNbdfo82+pULQxTZ2YY5RESZkyAE84EzJG6nEw9VXIc1wgCuHIx4uSV5gKuYqI913c6J8h07z9HO4cXuvZr9QGX1AYN2SwB7CvQrfKcBqyFS5UAobSqSO3wVzCGaKK6z21EHMLqLQmocxdoCyWMlrZVK/qRQRuEKYbxM1SiXt2a+wAlhMEZStw8ucgloBZbLg4wYkr3B+wht5aosMyWhX6pRDy1bjhso8IbjtQitKBCDVhJ+IIgT6EsiiTBBAuTSvbBC0va/Fq0fFHnFJ8An7WgusdHyFFNOkx3C1xLCbz5tW25Vfps5rA+0nKtre3HLxNVS9vL7vDzqgPDl6cztdVxL/p1XFj3BxIRNCmdDXjZ51AHNEDEg0ja32328gBlcM66qF5A4KIqXSyq3kxeBi64O0BZmc6yS3enML/4pLEmf3+MExZNTSwFsvm+O8/oi5BX9wdwUBmUUvqKsrqph93dWHYY6WISxhbbUNe5cyrODLBKwrC+5YswgYqdkJ1RS2lxnFfLkdFWssquErUxMo2JlxhNXkGeXRG9qResfobk7hDJB2vEj0zK6J3kh40W3+OWecZoykE2usBreBo3FPEURWXhi4jrV+uvUmxMQmoMGNsS8dGQIW4NXto/k1TLk45ggcC5yXDuICxTCjGUHTKPLnLCSRO/3QTbeaSdku71kf71fzoTwjLrMQGdEShgWx370EhX5pUf8nB4sL7teoiRsmVm5wInfGEx14IagXgGzF12u6bP09TKj+x0cSMTgp10JvTTV0pCs6LhJrOLP1irnzYpH31FmsDKWMDaKMpXwHfzEzhpNRh8iajm+INzlaEvodH+MQJzjzaYFGaKjopbv2gK+/YmrTksEC5ulLMp/jYECpocCE2W4s1GKxGipkVPOMWp5qs8UF3v2PYoOZmpSfM5JIGdyj8NfRwR5yHiEUP85izPMr9CwTu7X3kunSWO5T4ITN0L9s+6kWa4vpdnlQ5N8bRbkcaYyZ84SmxldvXQ6/8BL3AtFOtwysSlftRBwwF9z8PlFWX/hCWQbciVloCpfAAoAHDS5dAklHw8gV5f3ZHu4nXdPumKlegmF/GSq5Br69xUm+58buYAauMQTDRk14wkTcQ+BVjvdMATVrZepdT9rqxOBPtKVkI+J9dOYRQSEez5xFx+O6bKrgYjiBjsogsr7G8VVCEr3NP3H3DZKDk6NpPc5uMNe3Jr7eRplqtLPa+U+hYmxfEa3+5Vb7XQvI9FjqM3DJSzNExKGQ9w/AQLp+j1Z/Mj051uzrPkPuDoDWpGyLXpQsmS7Sv2uoho3yBZDqZ35JE82UYiY+VSyg7XDVQwesBtnEo4qmwX/z798UAZDCs7CHdHrCZBdqj9huopm7FVV/nnns8DQ5cB4ZM1JCXlxOlmjV3+JofdzzSCVN9IDJ5Dtd76bDmLyJ+uwsBJS93DgUMf50XkjXRlYCdXN7o/zXo8I38RaWIykkjeXcfkRTflnoSdCTdRrgdWE3uqDaTYyc8/6eg4GB47co/iXHWHV9Qaz5bZcxMpZJkX/AtFUKH8DwixA1rJOdny7dYv4hYxfMQ7iSnyi5A2Y0vvUztmr5DD3OC3C5cJot4MruXTT1PUB1d/fExFL8Kcqbzuz0/PEKeua55aLSfZk2euuXA9gvpqnkiKfARzksMpL4EkI6jRPbUdnnt60kDVOr3lGqyFj5sz3h6YhMZo0at931TDQxPj4KEEHfoER8aTIquL8pXONIK6pH4d1DWUvJ79c1EH0id3K5267azfFh5xupCGBYews8NUemfdeXXE1KoE2wAaoy+yRqGZ5zO6GxTIhns8b9YYawmEfk1xxSK2b9ObsgThs1eDyQCHtssAjSqaQoyVntTgZdQW+oZpxOML1VrjocyZKIvMBitD+VnP084DHrBBfk2l4tULI2vqc04Q01mYjnkvN6Yd4jh4fnNlLmHQ/wve8+rA5jpoMF9rfQSQnI=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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