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What is the value of opad in the HMAC structure?

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in Cryptograph & Network Security by (60.0k points)
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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