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The hash matrix of 8 × 8 is preferred over a 16 × 4 matrix because

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The hash matrix of 8 × 8 is preferred over a 16 × 4 matrix because

(a) it is symmetric

(b) it is smaller in size

(c) it is faster in computation

(d) none of the mentioned

I got this question in exam.

This is a very interesting question from Whirlpool Algorithm topic in section Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

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The correct answer is (c) it is faster in computation

To explain I would say: 8 × 8 is preferred because it is faster.

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