Q2. Block Ciphers and the Data Encryption Standard [10 points 1. What is the eff

Question

Q2. Block Ciphers and the Data Encryption Standard [10 points 1. What is the effect of using few encryption rounds by the Feistel cipher on the offered security (2 points) level of the technique? 2. What is the implication of greater complexity in the subkey generation on the cryptanalysis complexity for the Feistel Cipher? (2 points) 3. A change in one bit of the plaintext or one bit of the key should produce a change in many (I point) effect. bits of the ciphertext. This is referred to as the 4. In the Feistel block cipher theprovides the element of confusion of the (1 point) cipher.

Explanation / Answer

1. Fiestel cipher with lesser number of rounds could be broken with a known-plaintext attack more efficiently than by a brute-force attack.

2. Subkey generation algorithm: Greater complexity in this algorithm should lead to greater difficulty of cryptanalysis.

3. Avalanche effect

4. Substitution (S-Box)

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