Question $11$

$5$ Point

Bob received a digitally sined message from Alice. However, Alice claims she did not send the message. How does the digitally signed message guarantee that teh message was sent by Alice.

Bob decrypted the message digest with Alice's public key

Bob decrypted the message digest with Alice's private key

Alice used John's public key to encrypt the message digest

The message digest Bob received with the message did not match the message digest Bob computed

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