本书分为两篇：上篇给出广义密码、狭义密码、更狭义的密码的概念，并从密码发展历史沿革的视角介绍古典密码学和近代密码学，重点是通过直观、简洁的解释和实例，介绍现代密码学的主流密码算法；下篇通过示例和真实历史事件，进一步诠释古典密码学和近代密码学的应用。为了满足部分读者对密码破译和密码分析知识的需求，本书还专门介绍了M-209密码机以及更为抽象一些的密码分析知识和密码分析结果。
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