加密代码 /**解密 * @param content 待解密内容 * @param password 解密密钥 * @return */ public static byte[] decrypt(byte[] content, String password) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(password.getBytes())…

链接:http://poj.org/problem?id=1026 Cipher Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 21436   Accepted: 5891 Description Bob and Alice started to use a brand-new encoding scheme. Surprisingly it is not a Public Key Cryptosystem, but t…

1031: [JSOI2007]字符加密Cipher Time Limit: 10 Sec  Memory Limit: 162 MBSubmit: 6014  Solved: 2503[Submit][Status][Discuss] Description 喜欢钻研问题的JS同学,最近又迷上了对加密方法的思考.一天,他突然想出了一种他认为是终极的加密办法 :把需要加密的信息排成一圈,显然,它们有很多种不同的读法.例如下图,可以读作: JSOI07 SOI07J OI07JS I07JSO 0…

让上帝的归上帝,凯撒的归凯撒. 下面我们来介绍风靡全球的凯撒密码Caesar cipher,又叫移位密码. 移位密码也就是密码中的字母会按照指定的数量来做移位. 一个常见的案例就是ROT13密码,字母会移位13个位置.由'A' ↔ 'N', 'B' ↔ 'O',以此类推. 写一个ROT13函数,实现输入加密字符串,输出解密字符串. 所有的字母都是大写,不要转化任何非字母形式的字符(例如:空格,标点符号),遇到这些特殊字符,跳过它们. /*思路 26个字母的unicode码在65(A)与90(Z)…

Cipher Message Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Description Müller tried to catch Stierlitz red-handed many times, but always failed because Stierlitz could ever find some excuse. Once Stierlitz was looking…

Ancient Roman empire had a strong government system with various departments, including a secret service department. Important documents were sent between provinces and the capital in encrypted form to prevent eavesdropping. The most popular ciphers…

1031: [JSOI2007]字符加密Cipher Time Limit: 10 Sec  Memory Limit: 162 MBSubmit: 5504  Solved: 2277[Submit][Status][Discuss] Description 喜欢钻研问题的JS同学,最近又迷上了对加密方法的思考.一天,他突然想出了一种他认为是终极的加密办法 :把需要加密的信息排成一圈,显然,它们有很多种不同的读法.例如下图,可以读作: JSOI07 SOI07J OI07JS I07JSO 0…

Ancient Roman empire had a strong government system with various departments, including a secret service department. Important documents were sent between provinces and the capital in encrypted form to prevent eavesdropping. The most popular ciphers…

为了提高scp的传输速度指定了scp的加密算法为arcfour $ scp -c arcfour localFile userName@remoteIP:remoteFile 得到报错unknown cipher type $ ssh -c userName@remoteIP 得到报错no matching cipher found 解决办法:找到/etc/ssh/sshd_config,在文件最后加入一行 Ciphers 3des-cbc,blowfish-cbc,cast128-cbc,ar…

POJ - 1107 W's Cipher Time Limit: 1000MS Memory Limit: 10000KB 64bit IO Format: %I64d & %I64u Description Weird Wally's Wireless Widgets, Inc. manufactures an eclectic assortment of small, wireless, network capable devices, ranging from dog collars, …