Question: Since xor ( S , K ) = xor ( S , K ) , the input to the S - boxes ( and the

Since xor(S,K)=xor(S,K), the input to the S-boxes (and the Permutation) is the same.
When the output of the permutation is xored with the other half of S, well get C for that round of DES. This will keep on for all 16 rounds.

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