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

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。

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The core for information security is cryptology that includes private-key cryptology and public-key cryptology.

信息安全的核心是密码体制，包括私钥密码体制和公钥密码体制。

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