文章从消息层次上讨论了信息安全问题，重点介绍了信息理论密码学与复杂性理论密码学。

This paper discusses on the problem of information security from message level, and introduces emphatically information theory based cryptology and complexity theory based cryptology.

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密码学作为信息安全技术的核心领域，提供了多种密码算法与应用协议以满足人们实际应用的需要。

Cryptography is the core domain in the information security technique. It provides many algorithms and protocols to meet practical need.

youdao

密码学作为信息安全技术的核心领域，提供了多种密码算法与应用协议以满足人们实际应用的需要。

Cryptography is the core domain in the information security technique. It provides many algorithms and protocols to meet practical need.

youdao