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Bob designed another new scheme to detect whether a message is modified by an attacker (protecting data integrity). The scheme is to append to each

Bob designed another new scheme to detect whether a message is modified by an attacker (protecting data integrity). The scheme is to append to each message a SHA-256 hash of that message, then encrypt the whole appended message using AES with a known key to the public. Explain the vulnerability of Bobs design.

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