基于密码加密的暴力破解法。猜测密码长度，3-6位，并逐一尝试破解，找出正确密码。-Brute-force Search Attack on the Password-based Encryption The program is divided into three parts: encryption, decryption and brute-force attack, which are the three methods in my class. In the brute-for

A rainbow table is a precomputed table for reversing cryptographic hash functions, usually for cracking password hashes. Tables are usually used in recovering the plaintext password, up to a certain length consisting of a limited set of characters. I

置换密码算法的原理是不改变明文字符，只将字符在明文中的排列顺序改变，从而实现明文信息的加密。置换密码也叫换位密码。 试编程实现矩阵换位密码。它的加密方法是将明文中的字母按照给定的顺序安排在一个矩阵中，然后用根据密钥提供的顺序重新组合矩阵中的字母，形成密文。例如，明文为attack begins at five，密钥为cipher，将明文按照每行6个字母的形式排在矩阵中，如下形式： a t t a c k b e g i n s a t f i v e 根据密钥ciphe