DES

分组密码算法,可用于文件加密 该算法设计者是著名的华人密码学家来学嘉教授-Block cipher algorithm, can be used for file encryption algorithm designed by the famous Chinese cryptographer to Xuejia Professor

BASE64译码-BASE64 Decoding

密码技术实验一经典密码学实验维多利亚密码加密解密(Password technological experiments classic cryptography experimental Victoria password encryption and decryption)

本实验为编程实现 UDP 协议下使用 RSA 算法对信息的加密解密，用于两端之间的通讯 功能，开发平台为 win8.1， 开发环境 Eclipse， 开发语言 Java。(This experiment under the UDP protocol for programming using the RSA algorithm for encryption and decryption of information, for communication between the two ends of Function development platform is win8.1, the Eclipse development environment, programming language Java.)

DES(Data Encrypton Standard) 算法的实现网上已经有很多，本人在此讲述的是在DES算法加密过程中如何查看16迭代过程中生成的Ki,Li,Ri,Fi,Si等，这样可以当做一个DES加密对照器，这样可以方便的发现你在加密过程中出现的错误! -DES (Data Encrypton Standard) algorithm has been achieved online many, I would like to speak on is the DES encryption algorithm to see how the process 16 iterative process of generating Ki, Li, Ri, Fi, Si, etc., can serve as a control device DES encryption, this can easily find you in the process of encryption the mistakes!

DVD解码源代码 -This is a DVD decryption source program.

Base64 加密算法（Author 蒋柏良 Jerry Jiang)-* * DESCRIPTION * Base64 processes input in 24bit chunks by converting each chunk into 4 * bytes of output. It does so by splitting input into four 6bit groups and * using these as indexes in the following substitution table- * const char base64_map[] = * "ABCDEFGHIJKLMNOPQRSTUVWXYZ" * "abcdefghijklmnopqrstuvwxyz" * "0123456789+/" * If an input is not a multiple of 3 bytes, it s padded with zeros. In * this case the output bytes that consist entirely of the pad data are * replaced with = . * * Example * An input of 0x00 0x45 0xF2 is equivalent to 00000000 01000101 11110010 * bit sequence, which s then split into 000000 000100 010111 110010 * and these are substituted to produce the following base64 encoding * A E X y * * RETURN VALUE * b64_length() should return output length for the input of len bytes. * b64_encode() should encode len bytes from src int

128位(或192或256bit该代码以128为例)的密钥长度和分组长度，数据分组（输入的明文），先进行逐比特异或（AddRoundKey） 运算。然后通过循环十次非线性代换（SubBytes）、行变换（ShiftRows）、列变换（MixColumns）、逐比特异或【最后一轮不进行列变换】 的过程，输出128位（或192或256bit）数据即是密文。这就是加密过程。之后进行之前的逆过程，即可得到明文，此为解密过程。

说明：  lua rsa组件，在lua端对参数进行rsa加密和解密，效率高，好用(Lua RSA component, RSA encryption and decryption of parameters at Lua end, high efficiency and easy to use)

3Des encryption of text from a file, 3DES-EDC-CBC , using 3 keys