Question

Which is not true for Key-Wrapping?

(a) Used for small Plain Texts

(b) It has a relatively higher throughput than other modes

(c) It has block size of 64 bits

(d) It has n+1 cipher blocks, for n plaintext block

This question was addressed to me in unit test.

The question is from CCM, GCM and Key Wrapping in portion Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

Answer 1

The correct option is (b) It has a relatively higher throughput than other modes

To explain I would say: Key-Wrapping has a lower throughput than other modes.