Which three security services are provided by digital signatures? (Choose three.)
- provides confidentiality of digitally signed data
- guarantees data has not changed in transit
- provides nonrepudiation using HMAC functions
- provides data encryption
- authenticates the source
- authenticates the destination
Explanation: Digital signatures provide three basic security services:
Authenticity of digitally signed data – Digital signatures authenticate a source, proving that a certain party has seen and signed the data in question.
Integrity of digitally signed data – Digital signatures guarantee that the data has not changed from the time it was signed.
Nonrepudiation of the transaction – The recipient can take the data to a third party, and the third party accepts the digital signature as a proof that this data exchange did take place. The signing party cannot repudiate that it has signed the data.
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