Suppose hhm where h is a cryptographic hash function is it, Computer Engineering

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Suppose hhm where h is a cryptographic hash function is it

(i) Suppose Alice wants to send a long message m to Bob. If Alice and Bob already share a secret key k, and they use HMAC to protect the integrity of the message m, what should the message format be (or what components should the message have)?

(ii) Suppose h=H(m), where H is a cryptographic hash function. Is it feasible for an attacker to derive m from h?

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Computer Engineering: Suppose hhm where h is a cryptographic hash function is it

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