PKI Tutorials - Herong's Tutorial Examples - v2.20, by Dr. Herong Yang
Digital Signature Scheme for Email Messages
This section describes the digital signature scheme for email messages. The process of signing an email message is the same as signing other digital documents.
To help you understand the digital signature process, I found this diagram from Ghacks.net:
The diagram shows you that:
Note that the picture above only verifies the integrity of the received document. It does not cover the verification of sender's identity.
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