Richard Spillman著，第一部分介绍了密码学的经典问题，第二部分介绍了现代密码学，包括流加密法，块加密法和公共密钥加密法，第三部分介绍了密码学的未来，并对量子加密法进行了简单介绍

-Richard Spillman zhao, the first part introduces the classic question of cryptography, the second part presents a modern cryptography, including flow encryption, blocks encryption method and the public key encryption method is introduced, the third part of cryptography to future and quantum encryption method is simply introduced