S/MIME Specification Elements

S/MIME Version 3

Message Specification

New Subtypes and Parameters

Encrypted-Only Format

That Uses Digital Envelope

“pkcs7-mime” Subtype

Signed-Only Format

That Uses Digital Signature

“pkcs7-mime” Subtype

Multipart-Signed Format

with “Detached” Signature

“pkcs7-signature” Subtype

Cryptographic Message Syntax

Encoded Binary Data

Enhanced Security Services

CMS Enveloped-Data Object

With Three Methods

Of Key Distribution

CMS Signed-Data Object

Triple Wrapping

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