18/31 第1章 密码学概述 1.3.3 对密码系统的攻击（续） ②已知明文攻击（Plaintext-known attack） 已知明文攻击是指密码分析者除了有截获的密文外，还有一些已知的 “明文—密文对”来破译密码。
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Known plaintext attack 已知明文攻击
known-plaintext attack 明文攻击 ; 已知明文攻击
Known Plaintext Attack - KPA 已知明文攻击
Homeostasis attack of this kind of scheme is also proposed with known plaintext, all of these could make up the shortcoming of theory analysis.
最后给出了对该类方案的已知明文的同态攻击方法，弥补了该类方案理论分析上的不足。
A improved algorithm that builds security channel is provided, the new algorithm not only against known-plaintext attack, but also enhance efficiency of operation for encryption and decryption.
提出了一种改进的安全信道建立算法，新的算法能够承受已知明文攻击，同时还提高了加、解密运算的效率。
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