vigenere密码在起初的破译中是靠穷举法，找出与阅读习惯最适合的明文，但是也可以先缩小穷举范围，再查找-vigenere initial crack passwords by brute-force method is to identify the most suitable and clear reading habits, but can also be reduced exhaustive range, and then find

Playfair 密码，可实现对信息的加密，并可对信息解密得到原明文-Playfair password, you can realize the information is encrypted and decrypted original plaintext information