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What are the three most important functions that Digital Signatures perform? % %A. Integrity, Confidentiality and Authorization % %B. Integrity, Authentication and Nonrepudiation % %C. Authorization, Authentication and Nonrepudiation % %D. Authorization, Detection, and Accountability
B
No alternative
Correct answer: B
A digital signature is a quantity associated with a message that only someone with knowledge of an entity's private key could have generated, but which can be verified through knowledge of that entity's public key.
Digital signatures perform three very important functions:
integrity - A digital signature allows the recipient of a given file or message to detect whether that file or message has been modified. authentication - A digital signature makes it possible to verify cryptographically the identity of the person who signed a given message. nonrepudiation - A digital signature prevents the sender of a message from later claiming that it did not send the message.
Reference: https://docs.oracle.com/cd/A58617_01/network.804/a54088/conc1.htm
TIPTON, Harold F. & KRAUSE, MICKI, Information Security Management Handbook, 4th Edition, Volume 2.
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