快速去除PDF密码设置，不用安装，直接使用

MD5以512位分组来处理输入的信息，且每一分组又被划分为16个32位子分组，经过了一系列的处理后，算法的输出由四个32位分组组成，将这四个32位分组级联后将生成一个128位散列值。 -MD5 with 512-bit packet to process the input information, and each group was again divided into 16 32-seat group, after a series of processing, the algorithm" s output consists of four 32-bit group composed of these four 32-bit Cascade Group will generate a 128-bit hash value.

S盒的线性逼近表的运算,可在程序里面修改数值,这是一本密码学的书籍上的题目的运算程序-S-box linear approximation table calculations, which can be modified numerical procedure, which is a cryptography book on the topic of computing procedures

测试对字符串的MD4。运行环境：vs2008 （注意选择“多字符”编译）-Testing of the string MD4. Operating environment: vs2008 (attention to the selection " multi-character" compilation)

密码编码学――加密方法的C与C++实现，该程序最好在VC环境下编译-cryptographers-- encryption methods of C and C to achieve the best procedures in the VC environment compiler

线形移位存储器生成流密码-linear displacement flow generated password memory

软件模拟CRC冗余校验，可以对任意长度的发送序列求16位校验和，并且可以对接收序列进行检查。有详细的中文注释，和模拟函数-simulation software CRC Redundancy Check, for any length of this sequence for 16 checksum, and to be able to receive sequence for the examination. The Chinese have detailed notes and simulation function

access数据库加密有几法，但用“设置安全机智向导”加密最为牢靠，又如何访问这样的数据库呢-access database encryption with a few laws, but "to provide a safety witty guide" the most secure encryption, how to access such a database?

base64编解码源码，绝对可用。二机制十六进制转换-base64 encode/decode in use

DIAMOND加密算法的原代码-separate encryption algorithm source code

基于 RSA 密码，我写在 C# 语言中。本软件为越南人的。With 这个软件，you 可以加密和解密文本与 p，q 汽车或者你可以选择 p，q 随机。