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Unit 3-Symmetric Key Crypto_Part16

Unit 3-Symmetric Key Crypto_Part16 - Finally the left side...

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Unit 3 - 31 One Round of DES Each stage of DES is performs the same set of operations using a different subkey acting on the output of the previous stage. Those operations are defined in three processes: Expansion permutation process, expands (from 32 to 48 bits) and permutates. The output is XORed with part of the key Substitution using 8 S-boxes, each one accepts 6 bits of input and produces 4 bits of output permutation using P-box.
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Unformatted text preview: Finally, the left side is XORed with the result and both sides are passed on to the next round Unit 3 - 32 DES Expansion Permutation Input 32 bits Output 48 bits 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 31 1 2 3 4 3 4 5 6 7 8 7 8 9 10 11 12 11 12 13 14 15 16 15 16 17 18 19 20 19 20 21 22 23 24 23 24 25 26 27 28 27 28 29 30 31 Note the duplication...
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