Alice sends Bob a plaintext message M and its digital signat…
Alice sends Bob a plaintext message M and its digital signature S, signed with Alice’s private key. However, Eve intercepts M and S before it gets to Bob, and then passes M’ and S’ on to Bob. We do not know what Eve may have done while intercepting the message. Bob, taking the message and signature that he received, uses Alice’s public key (which he already had beforehand). Bob is able to verify that S’ is the valid signature for M’. Which of the following should be true? (Select all that apply)
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