DES加密之下载分离器[强制]

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。通常,自动取款机(Automated Teller Machine,ATM)都使用DEA。它出自IBM的研究工作,IBM也曾对它拥有几年的专利权,但是在1983年已到期后,处于公有范围中,允许在特定条件下可以免除专利使用费而使用。1977年被美国政府正式采纳。 DES的原始思想可以参照二战德国的恩格玛机,其基本思想大致相同。传统的密码加密都是由古代的循环移位思想而来,恩格玛机在这个基础之上进行了扩散模糊。但是本质原理都是一样的。现代DES在二进制级别做着同样的事:替代模糊,增加分析的难度。 DES的加密原理,是使用一个 56 位的密钥以及附加的 8 位奇偶校验位,产生最大 64 位的分组大小。这是一个迭代的分组密码,使用称为 Feistel 的技术,其中将加密的文本块分成两半。使用子密钥对其中一半应用循环功能,然后将输出与另一半进行“异或”运算;接着交换这两半,这一过程会继续下去,但最后一个循环不交换。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+U8/gBf70/A7ZNI8cK3oqrmdKjVKrWGO4hvbenyn6JJ7OkqEt6U6k2g8VollSqNIa5Ps6YeWED1PEExWtjR7ZyWPzNDkVK322vUKMjIEv1JxUwqBDwryqnxwqyltLhkM8EIK0AJUr6aT+IP30nmNMbtJ4Wg4wxaUx0VG6a26Kmxiu2ldvbu+xXxBF8cWRAmcGXMxC9jzvNH/VGoV58e3XU9+ckAN0gxcL7xzEFG9Bz0pralMuBRCrlcVmgfsEuwUoYXvNwewQOTDQ2krV+C9T/RZKnWr78PL0aDxmM2kT0wsoqRLn5kXd22TIQcmaZf+ueOQ7ugGgGtJAU+GzlUSaF3JPawkZGhixHZVZl7zpSvYa7QHDcn/eMxmkr6BV47+PXyWB10X+7aquC0TShSXrr7kCV0SCdyS4twAb6uC43DPx/5EE9K77qHwho2JBAr5pGkj2grKc4H3KLwVKAD2eh73lG4ardL1ATN6t1m8p1PdK8gqZeYghJU1lhVSsloDId3Jpwb82DwyN9ptq0c0+oOz2ESUL7g7XQsD7SQfCvg3f4OEefExaDc1cMXyF5tSrn5sTsoNoR5OxdIKcIvZr4oGw1ZmWhQx70jKMrfeEWgGMZhch7NxCYt5WtqBlak8gikaV8/kX4B2tfTjdW5qdhRhHRbqA1us3Zn5D61/UH5UNLlsG+z2SqlqTXK/v1hmti05Ab2GWYAvhqe2l0v1ejkp6SymUKrrJfPeRnKpRZkSArAaAnIOLfw9eYaZGbob+feLbtq4t3t8wEMSVZW286D/UH8MmQaDWRpII1tBnLhw/uY3Q7WAmNsEktg+aHjE1B+siAvmnVqUqrDnr8mFOLavQouzIbLhonyU4uN1dKGDuBfEisEChP1EQANMAeLqU1gt3h3nvDUHGK84or8/hd2ULdIAOEYTo6X7SKWO8Jq2P3iDq6dnaA9uJ6642FZ5yf8Gpl0UrTxgKUKj1X6RLHKHIPKjfdC0frZ2cqzX6Yy1cWUeJ6ONZ6UF6WO/mCDutHhmwNtIzuRwJ6PGhYRAd9DrWzkANZc6/5RQjvfkz1fau2Jrj2GgUU2uTcqX1jPTXTDMIivZfvFn51FL6jnAO0bkhMCpcoT+Onv7FTHl2+5K5AsWxmLIfCe9gVNrMkT2zRFFh3a6cbFGntaBmE4rplcSfNsd7gmAkFqC5Ons08ZAvt3rK1OC5ySNRJoV4LTWGHHDczqhtDfRoSoimVApKkW6HvgyUTQnOhgEKMvoQpm4K9apsImHeM/qp7tOdJ8yHM7q+OgYO7xBarLOSoS/8aqPSUP9VgK2XK1zgdHzlp8ON1/ahJEQSl/KaR5o1UDaDrge5TgH3LOCcGymzNLkU36s7LByl5Oyb6vD4WakZv8wGXVCtV3GhjvybPiwJttW3V/YSTEFlMZYft1yPx/FrjaafINj8TzoocMY+36D7Dhr9T+MgHVUpbcLQEy15pVRRPSFWRhCfV0bIx3ZiNk2huBVrELNJN06dTZgiv6GfiQl5+msp8Zsq/VhAGmCJaVTOZ7xgZr5tbBNWM9E8e7ZnlWQuq44IVFGFsHXW3YsE/xHEu3PBS0TG4R+dMHXynDM8jjKg9FPbKLuUw6iYk8jGVIvD8QarQa6U7gaGTE9IhfWiEYAXyaz30QZWOPwQcmkrf9WzIcEhENah3MznLPfXTCYjqFtCVz9P1nx0LFLHF5s4ykHXOsLzGXosGXx260q8gJ3gfQ3nDeIcJspG4NI1UAgzpgRw9dfS/5lj/VPUhmoppECOgdBtLX/UrP6yLZ/xKHFD5MG/dTpvKaO7v6QSuWRzGwFC6uLvxzF2nFcLeKJHhZLTCB8P04OcTy+tn9J2bclGorBTOnSca7ImlEarHwpGiKGafF942lp0CzOd3YtMrkXisLMwzW+0RKhnSe3c41zdjt8mve3qp3IMPN4F24cKDuqqDD0+XCDewcgTfZa7GMGCG8fUEsZ1iafua9UmS2uM/dwQOlNkQqGnR1n9cSnnHM4n5l6g73X00oxmyAm7wG6Eypmkf7xN59krGtiU9VQInvqpJS8IsyzcE1R/P96jcQVDLyIca3Qi3UOVFJ+j2x5p++zO0kzVdD461IX0l+xjTEag27YdYHcN2HOZo3QQ+CeILWC6w5+aGhmiYrPpt6bNWGBzLmKZMup3SRJk9iyaaoAKW+Enjprbprv3ePMRgiZ68klYURLBZ5q1j+/BNcxXgHdVs7N6FqpZ4F4IQFfQzzzV6aZ7y4Ux6sJ53GltbY5kVHeVeMBxjzXHqn9UV1oatKrjkAX/OhA4X/ucu57qO5q3uN/HGKNuMZPR9dIgB0ix3H6WK1nMh/Ytjr5r0VIwZk1r+B3aXd0SQSG7DlpkVpmKTkvGVmfjJJXBX0AmkHU3IhM7tIZNkVdnIjik/L5qWIwY0GW0RM4Jyf4GjRJVfxk/DE25GBkxGTdWaxqvaeR6hFc9KU2xZu1gKpiSch3vt7Q6MYgsZvDJOvQ26oPZ05PS359Cu/g7lXVKK+6XNA+qYKSWnytOPNlN9hWnlN5LDEyWFeH69G3ApPsw4kIHMc7rfIEmYVCxZsalpsHFCuPv6U+ckrc5k6R7jRSXZY+PbGq/Dizb4KoS8SKbdM/firx1FVjaaj3ByGeBayTGsT6uyqPCbuKnuBAGsAoEBm/GyNiKgeMKCErFpijGsK8MMqskqg7OQCSFfsRv1Q/icJ5xLRA4zRYgCV2HowLjZ6hxbLxqxsr+nNHFn8MaQXy8Yo86EawV3DMEuYnd/IPShoW/OLdWOVv3gCHqhVkPgn5PzNogZhCCFqPsgia/NERfwhsm1aMbQl9GqrQAPqnYhleiolqgyMXkotL7hVp02N5ceVlnOJSo0redBiBgDh0FeNKQaZXlYOlbbz2TZxHJfNpemmEgOLQRJ3vWK49wISsGrvO1yP2lD5Dryf+wCHR/GofX4ChxciaoxQxbDVcbceHc1ua5wD+H9oOA/+rJLtfekMr079g5fb9Td7yWOKxZgXPu+dkgRo4ocYZTmhXjucyVfoE7/he/T/Y95JYCbEekFpsxzh9Nm91ttIO9iCDq1K+vr/435SDEGZlMmzGB/+yO4p0i/m6pVvksVGd36t5VCDSeymgrBgYbmnW9UjvSFbQyoRIf0TXm+wugb9JRFEapDgV9KBsWoXXpY4tPCs9NU0sjpbPFNLiCGcw94Yq3NYwX3f0VaAxqei1G1qnHbDSvknf5arSsEQCwfJj1Guw1THduMkNj0Z4MCIIcUGISQ7RRX7jgtYtAp4AV6W+EAyGCnGZKrLv9OVhoAUhX/tzHeysgrwWECaB1/ARppYk3PEnP7/CdxVhzlp4JJ9wPaLYF5Wmzpizg64d4K5iqjHZ+NXBxWeIq48zXcOJd2xHSpETt+a1N09d8xtKKm568LAh7686F0Yc7b2h91VphDdNSJ2PpctJ4qPM1AJPQykU6xZtUgMBcy131ZNEg9wav6/0kL73unPRG08s703euMVYUrWJ3ecRWNHe/6Lxf/nSHWOoJarysK8PrGmOQMKBed5B3HZ/eOqgcTAQFExRv+R4t/bNZB+CYKhrQ+Z9Zs039lC9YrPzc+HTCKvRfcf3jJNvz29ZFLU1SCNiXreCXa/VIhwVIvqH2F23OR3IEmjbYCKCMnupA+MSGgInD3Vyw7jl3HwoojO11vIGqVuZVIH3jsidt7qrmFDT0XI4kg6K/oKNOrba2HCj1QLMajXHPR3zO5a0oAWJ8EImDN08BGZ/JIAMIIgNbf6aCVh1VqRsCQ7qYMQnwtFOyrRieArC4HQGUB3MDSpC9mIfIF4CqrfmfXFWKvd2UomfdoZSemZyLhBc8XLWbFN/s2JSb3D5p3kprfkrqguNajqysjy2nclWjSsa0yy4KdDS+OL4+HQTy3MvJuhn2wawoKjZhU+mT221hixMQYs9bKSqfWc531gZI4w1QMDIvqLSjCwW+dXOTJ1lbPzr3aWyVrx94xtOTE7+hDFeDBfItFARcPmNPfwriA8Cu3eTOx10yek9z2z5rNyH/maW5co27RyGr42xULqiBj8gU9ztV76oIoevoNeb9DKgD5FtvCmBke3kbWIhSyfVcgX3BMsD19OdEOS2TLBuYW9erpYGsUDO/6SgXRTbDL7ua4nWkVtbdYypfwSfHS01VokBWqfnGRcHHTRxv/0zFbJB9e3Zf6PPYsJ5mBv6AHDpzg2rXYc/XGqyDJCu+kor2PZpnQS3i0XVRq43WMLG73Pq8hv7Y5G2QWjx6ggXir4Iww0XQtSRiDrgOH4Un6QG4h9vaIxh7jFLRkRNUX6dkIV/ViELAF2ULV4YZQKhtK743kkVaAZIzTpNyIl7ODZRoWi6x9pAVM/QdYgS3XN4ERvY1YXLugF+FHppmwKIEv+oAeJIo9NROUhB/k+w2HOnn8dQ16NSU1AmAUJIF4J8vLbA1fsWfHzp8dXL9qSC3ey7vEme52zAtopG642jHM/lDcLq+t66GI/gpf8FtuSm5r+3r/NfVSJX0ZZuIBrRw2sV8v6pBBYTZK8ZS2pRLdJ0Iq7emmGNcbyHkW6RyuSVwzzyGX6hp77nWO42LgWm/bx0YsYLN0nZ2SYODSF3xf3KARFtUtQflfERGMgqEVUfCOWPmNh+0LMDEjHvVzEjofz5RPSJ/bxdnO/hiKtIKiR8uRryxTO/7fXIXUlAB0Lb1DjlyuHZif3zMxUrVBzOJRtl7/JzygZ2JH0GOM12DMwpW8QdhtYEQVsYZ1HgG9QX0FRM/bGWQA3asBEAisj89s/G7niVYfqPTEeBzgEaTMs0KFJ8/hEAvmH2qGguoEvuKZjtqH2BjOBYHYt34WaOmccfbYru6G+VdexT4iUDQOVn6/lFNkU/uXsIjWFk/7gH6t5zlrEHLL+0uNQOnukHeFpjXPPOuQC5tBvBx+OnBmsy7tcTRtGS98/CFcQMDllRCUYdv5b0B47nat+0TsByihYljhD5Oq3g6oqf9nxWRjG7i5eG3lfP5zFvWXHstEY5BNxjG3jnpoaplUHxPfWr6wPnfr/LB3JgYAmj9WOY2gJJIRccLECXXyDPNK01u0l+xiAsNG0zHquH9ocrk+P2HyUgiR4Rhr60ZJHfD1wCrBZP5Ua4vpRd6f6bn0KCq/E1M/CNbM5RhYWMkUA+bpxF1PWzytVjsZWpuTyZKxLkfz/icd9Tv6tMPNGK0ygJKylT5oHfC/UKOoeimHIUktfpGfb6ER2Mq9W6dUSLPhbfOlrTdX1FGf99/FUiuBAtY8idt5YvEhDNst+ELJtXns4N1uFl0WZAmmiglzV8VIOLep7YXza2GkPGNwUKN2KwBlJi5lh/pAl9dlv3SwWSNWkA8pILM5JVINYCHSPnmDa+fBygyKyetd2KqEB1MUbwGodmqrJ1dftGFEafkCb/7oYIi/Cwb6hnsvpDFH24rCWi4oHdA8+dJwYreO5Ib6AmNjHEXFd9ID+zpHfcQwpSOHrmnY7I81E8RqfttCbWfLQjgiK9F0FJH/WuZH6UuOgiWYMsfjemu4N/HQYvL5B3icqU2iOman8kWgA1CiMzKsqwCCTC+bTR/c+PA9iINLNw9/0ktiFA+O4pNWeOJ9W2meyOHg3tc+CvAcTfYqL92niEsF7QGySxhPWesiCfRUx8hFog+2VTITRjPVRXyyWB2cJpxGVpbsjzYRAs2/nF1adtU5wC4D3BUqAksItCte78QBRz51fCWQhU8gOR51ysrsH7duERrSy/1jvYyG7TKrF/HRxB4kXQiauQ9RfPGpsoCwlxOMF0oVRD+z/G1YHEkH63KUQb3kNU7+mJM2AxLC6HKsea5/KimjAS3buRdQ4PJCi1cGVlefHb9jjEKtZCtlQUzafrbuMs+83iFDo0OCX17sJFZOS950dslgPSeZi9Lk930wfxScmCt2XwBoDjjQRUhYJYk2zbsZOVBdNGtJn9HofmEhyvrz70ftU6X9imnqKP0Dun9+zuEW4fi20MzPT23pzFR70AbA1BqACFY0MLxBACq73lDjxsqDOp25KvTHNkhtOBbJESCQKxCZeT6J8AI5ebl1LE0fJDE+spolaPqHt25PZW9Oyhz+BHIizcBhDHCdmw7/VjMLvTfuxUJVyyTHa3PNhQx76twAb8UvQZSVixxBVbFZ824dFqdNaRQKqXyqc7/r9ggUI+0PR6XrrtW8XZTIcQozd/nXMJLyEulY0P7pbmkS9U2sGPK6b4LecRtKA7vOYqyMyYVrDzzI4lyi03S9xXNuup4C22vNAzU7IOk6Kb51oOWL0OKOpI3jHyrrxXFS/3iUWRcHIGx5gUyr/vgWy9CNQNAsF7YCvXQZUPEmwDLPh1bfdMYddS3KP3NRlpjN0Ku/AOouqi+Ap/hLwZEkXEkK2r+gldUzzm7HTY+YDQtMtk+i0n9VW3dH9D5W1r70wCqDybydZ+HwxcFouxfzYT6RuvBPRQrafCJOH7X7PYvefgImm+tcfHFZDlwj5m6WyKzV9ztSQu4Y=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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