Page 124 - CISSO_Prep_ Guide
P. 124
As can be seen in this diagram, the message itself is not
confidential. The purpose of a digital signature is to provide
message integrity and proof of origin - not message
confidentiality. Now, when Alice sends a message to Bob, Bob
knows that the message came from Alice since he was able to
unlock the digital signature with Alice's public key (and
therefore, it MUST have been encrypted with Alice's private
key). Bob also knows that the message he received is exactly the
same as the message Alice wanted to send him because the hash
of the received message is the same as the hash that Alice had
signed.
