source of reference: Privacy-Enhanced Mail (The Free Encyclopedia WikipediA) last edited on 30 May 2019, at 15:44 UTC, URL: https://en.wikipedia.org/
Privacy-Enhanced Mail (PEM) is a de facto file format for storing and sending cryptographic keys, certificates, and other data, based on a set of 1993 IETF standards defining "privacy-enhanced mail." While the original standards were never broadly adopted, and were supplanted by PGP and S/MIME, the textual encoding they defined became very popular. The PEM format was eventually formalized by the IETF in RFC 7468...