RFC 9921 - CBOR Object Signing and Encryption (COSE) Header Parameter for Timestamp Tokens as Defined in RFC 3161

Status: Proposed Standard
Published: February 2026
Stream: IETF
Errata: No Errata

Abstract

This document defines two CBOR Object Signing and Encryption (COSE) header parameters for incorporating timestamping based on RFC 3161 into COSE message structures (COSE_Sign and COSE_Sign1). This enables the use of established timestamping infrastructure per RFC 3161 in COSE-based protocols.

Official Text: RFC 9921
Official Page: RFC 9921 DataTracker
Errata: RFC Editor Errata

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