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K2 is derived by left shifting L by 2 bits. What is L defined as?(a) E(K , 0^b)(b) E(K , 10*^b)(c) E(K , 1^b)(d) E(K , 10*1^b)I had been asked this question in a national level competition.This question is from HMAC, DAA and CMAC topic in section Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security |
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Answer» CORRECT answer is (a) E(K , 0^b) To EXPLAIN: L is DEFINED as encrypting b-bits of 0s with the key K through the same algorithm. |
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