经典古典密码的实现，包含了加法密码，乘法密码，Vigenere体制密码等等(The realization of classical cryptography)

通过实验，使学生对古典密码学有充分的认识；学会正确使用编程语言（C/C++、Java、Maple等）实现希尔密码与攻击，验证课堂中所学的古典密码算法；为学习现代密码算法及其应用奠定基础。(Through the experiment, the students have sufficient knowledge of classical cryptography; learn the proper use of programming languages (C/C++, Java, Maple