RFC 9941 - Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512

• Status: Informational
• Published: April 2026
• Stream: IETF
• Errata: RFC Editor Errata

Abstract

RFC 9941 is an Informational IETF document describing the widely deployed SSH hybrid key exchange method based on Streamlined NTRU Prime sntrup761 and X25519 with SHA-512.

Contents

• 1. Introduction
• 2. Requirements Language
• 3. Key Exchange Method: sntrup761x25519-sha512
• 4. Security Considerations
• 5. IANA Considerations
• 6. References
• Appendix A. Test Vectors
• Acknowledgements
• Authors' Addresses

Related Resources

• Official Text: RFC 9941
• Official Page: RFC 9941 DataTracker
• Errata: RFC Editor Errata