Question

An _____________ cipher implements an independently chosen random even permutation for each of the key values. A) Asymmetric

B) Stream

C) Block

D) Ideal

Answer 1

A Block cipher implements an independently chosen random even permutation for each of the key values.

Step-by-step explanation:

A Block cipher implements an independently chosen random even permutation for each of the key values. In a block cipher, the input message is divided into fixed-sized blocks and each block is encrypted separately using a permutation defined by the key. The specific permutation used for each block depends on the key and is chosen randomly.

For example, the Advanced Encryption Standard (AES) is a block cipher that divides the input message into 128-bit blocks and applies a fixed set of permutations based on the key. Each block is encrypted independently using the chosen permutation.

Therefore, the correct answer to the question is Block.