Privacy Enhanced Mail

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Privacy Enhanced Mail ( PEM ) is a concept that defines various security services (confidentiality, authentic data origin, proof of origin) for e-mails . PEM was designed around 1990 and is only classified as historical by the Internet Engineering Task Force . The certification authorities are organized hierarchically. PEM users must sign every message. It is not possible for them to send anonymous messages.

At PEM everyone has the opportunity to check the signature, even if the message itself cannot be read.

PEM is limited to the American Standard Code for Information Interchange . The MIME Object Security Services (MOSS) were a synthesis of PEM and Multipurpose Internet Mail Extensions .

PEM was an innovative concept that never went productive. The exchange file format, on the other hand, has become very widespread and was republished in 2015 as RFC 7468 (Textual Encodings of PKIX, PKCS, and CMS Structures), after which the original RFC standards were overridden.

Norms and standards

  • J. Linn:  RFC 1421 . - Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures . February 1993. (Replaces RFC 1113 - historical - English).
  • S. Kent:  RFC 1422 . - Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key Management . February 1993. (Replaces RFC 1114 - historical - English).
  • D. Balenson:  RFC 1423 . - Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and Identifiers . February 1993. (Replaces RFC 1115 - historical - English).
  • B. Kaliski:  RFC 1424 . - Privacy Enhancement for Internet Electronic Mail: Part IV: Key Certification and Related Services . February 1993. (Historical - English).

Individual evidence

  1. ^ S. Crocker, N. Freed, J. Galvin, S. Murphy:  RFC 1848 . - MIME Object Security Services . October 1995. (Historical - English).