讲解通信之道，详解其原理过程，对小白有较好的扫盲帮助

量子通信理论研究 清华优秀博士论文！ 能适用于相关通信行业前瞻！

现代通信理论--李白萍是一个大约5个章节的ppt，通常适用于一些通信专业的研究生。

The problems of cryptography and secrecy systems furnish an interesting application of communication theory. In this paper a theory of secrecy systems is developed. The approach is on a theoretical level and is intended to complement the treatment found in standard works on cryptography. There, a detailed study is made of the many standard types of codes and ciphers, and of the ways of breaking them. We will be more concerned with the general mathematical structure and properties of secrecy systems.