What is the output of the first round of the des algorithm

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Reference no: EM133241417

Cryptography Questions -

Q1- What is the output of the first round of the DES algorithm when the first and last bits of plaintext' and the key bits are ones, and the remaining bits are zero? Show your work (How to generate keys and each step until the output of the first round).

Q2- An avalanche effect is also desirable for the key: A one-bit change in a key should result in a dramatically different ciphertext if the plaintext is unchanged.

i. Assume an encryption with a given key. Now assume the key bit at position 1 (prior to PC - 1) is being flipped. Which S-boxes in which rounds are affected by the bit flip during DES encryption?

ii. Which S-boxes in which DES rounds are affected by this bit flip during DES decryption?

Reference no: EM133241417

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