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( 4 points ) In this problem we will work through a round of DES. For notational simplicity, assume it is the first round. Please
points In this problem we will work through a round of DES.
For notational simplicity, assume it is the first round.
Please enter all answers as strings of s and s
The input is the bit block
Suppose that the subkey for the current round is this bit number:
What does the bit state look like after the IP transformation is applied to the input?
Now find and the left and right halves of the state.
What is the result of applying the expansion box to
What is the result of XORing the subkey with
We now apply the Sbox transformation.
Finally we apply the permutation box to complete the function
We can now compute the state of DES going into the next round.
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