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本文根据DES中生成内部密钥的左移次数,给出了一种搜索密钥空间的新方法。就搜索时间来看,此方法把密钥空间的大小由2~(56)下降到2~(54)。
This paper presents a new method to search the key space according to the left shift times of internal keys generated in DES. From the search time point of view, this method reduces the size of the key space from 2 ~ (56) to 2 ~ (54).