This Recommendation | International Standard enhances the existing cryptographic message syntax (CMS) protocol by adding signcryption techniques and providing a new Abstract Syntax Notation One (ASN.1) module which conforms to the latest edition of the ASN.1 standard which can be used with all standardized encoding rules of ASN.1.st edition 2021-03 Information technology — Generic applications of ASN.1 — Part 4: Cryptographic message syntax Reference number ISO/IEC 24824-4:2021(E) ？ ISO/IEC 2021 ISO/IEC 24824-4:2021(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO/IEC 2021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this p