Posted: December 30th, 2021

1. Answer the following questions based on the following input to the DES algorithm (assume both plaintext message and key are the same) Hexademical notation : F E D C B A 0 9 8 7 6 5 4 3 2 1 a. Convert the input value from hex notation into its equivalent binary notation b. Derive the first round subkey c. Derive the left and right halves of the plaintext message for use in the first DES round then show how the right half is expanded to 48-bits d. What is the binary operation used to combine the output from (b) with (c). Show the output of this operation using your answers from (b) and (c) e. The output from (d) is passed through the S-box operation. Explain what this operation is for and what is the output using the S-box tables shown in the lecture slides.

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