Question: Suppose you are using key K together with SHA256 hash function to construct SHA256HMAC function. Answer each of the following: a) What value does

Suppose you are using key K together with SHA256 hash function to construct SHA256HMAC function. Answer each [ 10 points ] Suppose you are have a message digest hash function SHA224. Write your answers in bytes (not

Suppose you are using key K together with SHA256 hash function to construct SHA256HMAC function. Answer each of the following: a) What value does opad contain and how many times is it repeated? Provide the exact numerical value. b) What value does ipad contain and how many times is it repeated? Provide the exact numerical value. c) What is the purpose of the opad and ipad values in HMAC? [ 10 points ] Suppose you are have a message digest hash function SHA224. Write your answers in bytes (not bits) for the the following two sub-questions: a) What is the size of each message block? b) What is the size of the final output hash? Message Block 1 Message Block 2 Message Block n IV 00 Hash Key

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