S/MIME | DisamKB

S/MIME

E37201

IETF standard cryptographic protocol email security standard

S/MIME is a widely used standard for secure email that provides encryption and digital signatures using public key cryptography.

Aliases (5)

CMS (Cryptographic Message Syntax) ×1
S/MIME v3 ×1
S/MIME v3.1 ×1
S/MIME v4.0 ×1
Secure/Multipurpose Internet Mail Extensions ×1

Statements (50)

Predicate	Object
instanceOf	IETF standard → cryptographic protocol → email security standard →
basedOn	MIME →
compatibleWith	IMAP → POP3 → SMTP →
competesWith	OpenPGP →
definedIn	RFC 5751 → RFC 8551 →
extends	MIME →
fullName	Secure/Multipurpose Internet Mail Extensions →
goal	authenticity of sender → confidentiality of email → integrity of email → interoperable secure email →
operatesAt	application layer →
protects	email attachments → email message body →
provides	digital signatures → email encryption → message authentication → message integrity → non-repudiation →
requires	Public Key Infrastructure → trusted Certificate Authorities →
standardizedBy	IETF →
supportedBy	Apple Mail → Microsoft Outlook → Mozilla Thunderbird → many mobile email clients →
supports	certificate chains → certificate revocation lists → certificate-based authentication → end-to-end email encryption → key management via certificates → signing of email messages →
usedIn	commercial email clients → corporate email systems → government email systems →
uses	CMS (Cryptographic Message Syntax) → PKCS #7 → X.509 certificates → asymmetric encryption for key exchange → hash functions for signatures → public key cryptography → symmetric encryption for message content →
version	S/MIME v3 → S/MIME v3.1 → S/MIME v4.0 →

Referenced by (12)

Subject (surface form when different)	Predicate
S/MIME ("S/MIME v3") → S/MIME ("S/MIME v3.1") → S/MIME ("S/MIME v4.0") →	version
GNU Privacy Guard → Werner Koch →	supportsStandard
ASN.1 → PKCS #1 →	usedIn
RSA → X.509 certificate →	usedInProtocol
S/MIME ("Secure/Multipurpose Internet Mail Extensions") →	fullName
RFC 8017 →	relatedTo
S/MIME ("CMS (Cryptographic Message Syntax)") →	uses