数学符号运算maple，用于推导符号表达式。(Mathematical symbols computing maple for symbolic expression is derived.)

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

maple软件里使用的区间数学工具包v1.2版本(The v1.2 version of interval mathematics toolkit used in Maple software.)