Playfair Cipher 1.not even the large number of keys in a monoalphabetic cipher provides security 2.one approach to improving security was to encrypt multiple letters 3.the Playfair Cipher is an example 4.invented by Charles Wheatstone in 1854

一个简单的利用矩阵变换来进行加密的小程序。利用JAVA实现。-The use of a simple matrix transformation to carry out encrypted applet. The use of JAVA implementation.

一个由邻接矩阵直接求解可达矩阵的计算工具,JAVA语言编程-The solution to a directly by adjacency matrix matrix calculation tool, the JAVA programming language