不错的希尔代码，希尔是一种经典的加密算法，加密可以通过一线形变换，脱密再做依次逆变换。密钥就是变换矩阵本身。-good code Hill, Hill is a classic encryption algorithms, encryption can transform line shape, followed again from close inverse transform. Key is the transformation matrix itself.

任意逆矩阵程序算法，可以对通信数据加密，保密性好。-Inverse matrix algorithm any program that can encrypt the communication data, privacy is good.

置换密码亦称换位密码。置换只不过是一个简单的换位。每个置换都可以用一个置换矩阵 来表示。每个置换都有一个与之对应的逆置换 。置换密码的特点是仅有一个发送方和接收方知道的加密置换（用于加密）和对应的逆置换（用于解密）。它是对明文 长字母组中的字母位置进行重新排列，而每个字母本身并不改变。-Password replacement, also known as transposition cipher. Replacement is just a simple transposition. Each

用于进行矩阵逆变换的加密的matlab测试代码，用于进行数据库代理加密的方案。-Encrypted matlab test code for matrix inverse transform is used for database encryption scheme agency.