中文摘要：

针对密码学课程复杂、抽象、学习难度很大的问题,设计和实现了基于C#的密码学实验演示系统。系统实现了密码学知识的介绍,并实现了用DES算法、RSA算法、移位代换算法、置换密码算法、MD5算法等算法进行加密和解密的演示。测试及应用结果表明,该系统具有常用加密算法的加密解密演示功能,对于密码学课程学习和相关内容的研究具有一定的帮助。

英文摘要：

Aiming at the problem that the cryptography course is complex, abstract and difficult to learn, using C# language, a cryptography experimental demonstration system is designed and implemented. The system realizes the introduction of cryptography knowledge, and the demonstration of the DES algorithm, RSA algorithm, shift substitution algorithm, permutation cipher algorithm, MD5 algorithm and so on for encryption and decryption. The test and application results show that the system has the encryption and decryption function of the commonly used encryption algorithms, which has certain help and reference value for the study of course and related content.