Secure Multipurpose Internet Mail Extensions (S/MIME)

{
  "id": "MLC-T-CYB-003763",
  "term": "Secure Multipurpose Internet Mail Extensions (S/MIME)",
  "field": "Cybersecurity",
  "definition": "1. A set of specifications for securing electronic mail. S/MIME is based upon the widely used MIME standard and describes a protocol for adding cryptographic security services through MIME encapsulation of digitally signed and encrypted objects. The basic security services offered by S/MIME are authentication, non-repudiation of origin, message integrity, and message privacy. Optional security services include signed receipts, security labels, secure mailing lists, and an extended method of identifying the signer’s certificate(s).\n\n2. A protocol defined in IETF RFCs 3850 through 3852 and 2634 for encrypting messages and creating certificates using public key cryptography. S/MIME is supported by default installations of many popular mail clients. S/MIME uses a classic, hierarchical design based on certificate authorities for its key management, making it suitable for medium to large implementations.",
  "abbreviation": "S/MIME",
  "references": [
    "CNSSI 4009-2015 from NIST SP 800-49",
    "NIST SP 800-45 Version 2",
    "NIST CSRC Glossary"
  ],
  "url": "https://mlchart.com/terminology/cybersecurity/secure-multipurpose-internet-mail-extensions-s-mime/"
}