RFC 9963 · PROPOSED STANDARD · 2026
MON · 27 JUL 2026
Legacy RSASSA-PKCS1-v1_5 Code Points for TLS 1.3
Overview
RFC 9963, “Legacy RSASSA-PKCS1-v1_5 Code Points for TLS 1.3”, is a Proposed Standard document published in April 2026 by D. Benjamin, A. Popov. The canonical text is published by the RFC Editor.
Abstract
This document allocates code points for the use of RSASSA-PKCS1-v1_5 with client certificates in TLS 1.3. This removes an obstacle for some deployments to migrate to TLS 1.3.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 9963 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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