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What is the value of opad in the HMAC structure?

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What is the value of opad in the HMAC structure?

(a) 00111110

(b) 00110010

(c) 10110110

(d) 01011100

This question was addressed to me by my school teacher while I was bunking the class.

My doubt stems from HMAC, DAA and CMAC topic in division Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

1 Answer

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Correct option is (d) 01011100

To explain I would say: opad is 5C in hexadecimal.

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