Question

For a 150-bit message and a 10-bit MAC, how many values are the MAC value dependent on?

(a) 2^140

(b) 2^150

(c) 2^15

(d) 2^10

The question was asked in exam.

I'd like to ask this question from Message Authentication Codes (MACs) topic in chapter Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

Answer 1

Right choice is (a) 2^140

To explain I would say: 2^150/2^10 = 2^140.