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How many add round key functions are present in the Whirlpool algorithm?

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How many add round key functions are present in the Whirlpool algorithm?

(a) 16

(b) 18

(c) 11

(d) 10

This question was posed to me in exam.

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

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Correct answer is (c) 11

Easiest explanation: There are 11 round key addition functions in the Whirlpool algorithm. One key addition per round. One key addition before the 1st round.

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