Computers and Technology, 29.02.2020 04:16 cylertroutner
Remember that it is desirable for good block ciphers that a change in one input bit affects many output bits, a property that is called diffusion or the avalanche effect. We try now to get a feeling for the avalanche property of DES. We apply an input word that has a "1" at bit position 33 and all other bits as well as the key are zero. (Note that the input word has to run through the initial permutation.) 1. How many S-boxes get different inputs compared to the case when an all-zero plaintext is provided? 2. What is the minimum number of output bits of the S-boxes that will change according to the S-box design criteria? 3. What is the output after the ļ¬rst round? 4. How many output bit after the ļ¬rst round have actually changed compared to the case when the plaintext is all zero? (Observe that we only consider a single round here. There will be more and more output differences after every new round. Hence the term avalanche effect.)
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Remember that it is desirable for good block ciphers that a change in one input bit affects many out...
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