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→Secure Multipurpose Internet Mail Extension
In addition to encrypting email messages, PGP also attaches a digital signature to the messages which can be used by the recipient to verify that the message has not been modified in any way since it was transmitted.
== Secure Multipurpose Internet Mail Extension (S/MIME) ==
The standard MIME protocol extends the Simple Mail Transfer Protocol (SMTP) to enable the inclusion of non-ASCII (i.e non-plain text) attachments such as binary, photo and audio files in email messages.
