古典密码体制研究：

包括希尔密码、维吉尼亚密码、仿射密码、置换和维吉尼亚结合密码体制，对超过10k大小的文本进行加密和解密。-Classical cryptography research: including Hill passwords, Virginia password, affine password, password replacement and Virginia combined system, the size of more than 10k text encryption and decryption.