A digital signature:
A.
Provides a secure key exchange mechanism over the Internet
B.
Automatically exchanges shared keys.
C.
Guarantees the authenticity and integrity of a message.
D.
Decrypts data to its original form.
A digital signature:
A digital signature:
A digital signature or digital signature scheme is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, and that it was not altered in transit. Digital signatures are commonly used for software distribution, financial transactions, and in other cases where it is important to detect forgery or tampering.
answer C
I choose