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{{Short description|Standard for public key encryption and signing of MIME data}}

{{Short description|Standard for public key encryption and signing of MIME data}}

{{More citations needed|date=August 2010}}'''S/MIME''' ('''Secure/Multipurpose Internet Mail Extensions''') is a standard for [[public-key encryption]] and [[Digital signature|signing]] of [[MIME]] data. S/MIME is on an [[Internet Engineering Task Force|IETF]] [[Internet standard|standards track]] and defined in a number of documents, most importantly {{IETF RFC|8551|leadout=and}}. It was originally developed by [[RSA Security|RSA Data Security]], and the original specification used the IETF MIME specification<ref>RFC 2045: Multipurpose Internet Mail Extensions (MIME). Part One was published in November 1996.</ref> with the de facto industry standard [[PKCS&nbsp;#7]] secure message format. Change control to S/MIME has since been vested in the IETF, and the specification is now layered on [[Cryptographic Message Syntax]] (CMS), an IETF specification that is identical in most respects with PKCS&nbsp;#7. S/MIME functionality is built into the majority of modern email software and interoperates between them. Since it is built on CMS, MIME can also hold an advanced digital signature.

{{More citations needed|date=August 2010}}'''S/MIME''' ('''Secure/Multipurpose Internet Mail Extensions''') is a standard for [[public-key encryption]] and [[Digital signature|signing]] of [[MIME]] data. S/MIME is on an [[Internet Engineering Task Force|IETF]] [[Internet standard|standards track]] and defined in a number of documents, most importantly {{IETF RFC|3369|3370|3850|3851|leadout=and}}. It was originally developed by [[RSA Security|RSA Data Security]], and the original specification used the IETF MIME specification<ref>RFC 2045: Multipurpose Internet Mail Extensions (MIME). Part One was published in November 1996.</ref> with the de facto industry standard [[PKCS&nbsp;#7]] secure message format. Change control to S/MIME has since been vested in the IETF, and the specification is now layered on [[Cryptographic Message Syntax]] (CMS), an IETF specification that is identical in most respects with PKCS&nbsp;#7. S/MIME functionality is built into the majority of modern email software and interoperates between them. Since it is built on CMS, MIME can also hold an advanced digital signature.



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