A new Request for Comments is now available in online RFC libraries.
RFC 9905
Title: Deprecating the Use of SHA-1
in DNSSEC Signature Algorithms
Author: W. Hardaker,
W. Kumari
Status: Standards Track
Stream: IETF
Date: November 2025
Mailbox: [email protected],
[email protected]
Pages: 5
Updates: RFC 4034, RFC 5155
I-D Tag: draft-ietf-dnsop-must-not-sha1-10.txt
URL: https://www.rfc-editor.org/info/rfc9905
DOI: 10.17487/RFC9905
This document deprecates the use of the RSASHA1 and
RSASHA1-NSEC3-SHA1 algorithms for the creation of DNS Public Key
(DNSKEY) and Resource Record Signature (RRSIG) records.
It updates RFCs 4034 and 5155 as it deprecates the use of these
algorithms.
This document is a product of the Domain Name System Operations Working Group
of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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