PEM (privacy enhanced mail)
Privacy-enhanced mail:-
Privacy-enhanced mail (PEM) is a file format for storing and sending cryptographic keys certificates, and other data, based on a set of 1993 IETF standards defining "privacy-enhanced mail."
1) It covers same territory as PGP.
2) PEM is privacy and authentication for RFC 822 based email system.
3) Messages sent using PEM are first converted to a canonical form so they all have same conventions about white space.