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

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.

1 .

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?

2 .

Which S

-

boxes in which DES rounds are affected by this bit flip during DES decryption?

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