Answer :
Although they are closely connected, authenticity and non-repudiation serve different purposes. While authenticity validates the message's sender and source, non-repudiation verifies the message's validity and legitimacy.
What does the term "non-repudiation" mean?
Assurance that both the sender and the recipient of the information are given proof of delivery and the sender's identity, so neither can subsequently deny processing the information.
What are secrecy and authentication?
a procedure for authentication that guarantees secret user IDs and passwords are sent to authorized users. Biometrics is another method of authentication. Role-based security techniques could be used to guarantee viewer or user authorization.
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