Quantum cryptography and computer cryptography are two branches of cryptography at the same age. Quantum cryptography based on the quantum mechanics can achieve unconditionally secure communications.

量子密码是与计算机密码处于同一时代的密码学分支，它以量子力学为基础，能实现无条件安全的保密通信。

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This article first analyzes the security of computer network, introduces basic technology that guarantee the security and emphasizes that cryptography is the core technology.

本文第一章分析计算机网络的安全性，介绍保障计算机网络安全的基本技术，指出密码技术是网络安全技术的核心。

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Information hiding is an interlaced subject, which is built on the basis of mathematics, modern cryptography, information processing theory, and computer applied techniques.

信息隐藏技术是一门建立在数学、现代密码学、信息处理理论和计算机应用技术基础上的交叉性学科。

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Lastly, research into computer science and cryptography for academic purposes should be lawful (read more on the topic here).

CNN: Unlocking your cell phone is no crime