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术语 key equivocation
释义 key equivocation
密钥混度
In information theory, the equivocation of a key in relation to receipt of a given ciphertext, given by Hc(K)=-∑P(C)∑Pc(K)log2(Pc(K)) where P(C) is the probability of receipt of ciphertext C, and Pc(K) is the probability that the key K was employed given that ciphertext C was received. If the key equivocation is zero then there is no uncertainty of the key employed. Key equivocation usually decreases as the length of the message is increased.
在信息论中,用以表示收到已知密文和密钥的关系,即 Hc(K)=-∑P(C)∑Pc(K)log2(Pc(K)) 其中P(C)是收到密文C的概率,Pc(K)是收到密文C后用指定的密钥K的条件概率。若密钥 混度等于零,则用上密钥K无不确定性。一般说来,信息长度增加,密钥混度将下降。
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