大二的时候写的RSA类头文件，集成了大数四则运算、幂模运算、米勒罗宾算法寻找大数等RSA加密必须的算法，详询《密码学原理与实践》-Sophomore writing the RSA class header file, integrated Tarsus four computing power modular arithmetic, Miller-Rabin algorithm must find large numbers RSA encryption algorithm, detailed

古典密码算法 　　通过编程实现替代密码算法和置换密码算法，加深对古典密码体系的了解，为以后深入学习密码学奠定基础。-Classical cryptographic algorithm By programming a substitution cipher algorithm and permutation cipher algorithm, a better understanding of classical cryptography, cryptology for the futu