Assuring the recipient of a message that the sending source

Assuring the recipient of a message that the sending source is who it claims to be is which Security Service? Confidentiality Integrity Authentication Non-repudiation

Solution

Answer: Authentication

In the case of a single message, assures the recipient that the message is from the source that it claims to be from

In the case of ongoing interaction, assures the two entities are authentic and that the connection is not interfered with in such a way that a third party can masquerade as one of the two legitimate parties.