Proof of Submission in an Electronic Mail System
Proof of submission is the ability of the sender to ascertain to the receiver that the email message has left his control. To achieve these, the sent email is stored in the senders out box and is passed on to the mail server. The mail server has a private, public key pair, calculates a message digest of the body of the email, and its metadata such as the time received and its identity. The mail server then signs the mail by encrypting the digest with its private key and sends the result to the sender of the email.
Non-Repudiation in an Electronic Mail System
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