Authenticity

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About

Authenticity is a functionality of cryptography that verifies that the sender of the message is who he claimed to be.

This functionality is implemented with the digital signature functionality.

And as a side effect, it allows a signed document to be used as credentials for authentication. Generally, a signed certificate is presented to the service to log in. To know more about it, see Cryptography - Public Key Authentication (Certificate-based, Sender Verification)


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