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What is the aspect of a digital signature that provides assurance a sender generated and sent the message?
All of these
Non-repudiation
Authentication
Data integrity
All of the above are features of a digital signature. Nonrepudiation ensures that the claimed sender cannot later deny generating and sending the message. Data integrity refers to changes in the plaintext message that would result in the recipient failing to compute the same message hash. Since only the claimed sender has the key, authentication ensures that the message has been sent by the claimed sender. Replay protection is a method that a recipient can use to check that the message was not intercepted and replayed.
Edit: a digital signature contains the message digest as well. Hence integrity is correct. As a matter of fact, if non-repudiation is correct, authentication should be correct as well. Use check box in this question is more appropriate.
Edit: corrected the presentation of the answers, fixed Non-Repudiation and removed the periods at the end. The answers are not sentences.
Edit: changed "all of the above" to "all of these", as the answers are randomly displayed.
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