Sending a message
Mark decides to send the article about the murder of a person to Frank. Mark uses Frank's public key to encrypt the article. Frank receives the article and then decodes the article so that it can be reviewed and sent to the printer.
Signing a message
Mark decides to send the article to Frank about a murder. Mark encrypts the code with his private key. Mark sends the message and his public key to Frank. Frank decodes the article with Mark's public key. Frank can then review the article and release it because he knows that it is Mark's work.
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