这是一个密码学的课程设计。里面包括SPN加密、线性密码分析、差分密码分析、改进的SPN、随机性检测、生成RSA算法的参数、实现RAS和文件加解密功能。使用的是gmp库。对于学习密码学很有参考价值。-It was a cryptography course design. Which includes SPN encryption, linear cryptanalysis, differential cryptanalysis, improved SPN, random testing, generate RSA algorithm parameters to achieve RAS and file encryption and decryption functions. Using gmp library. For the study of cryptography great reference value.