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IETF RFC 9941
[ACTIVE]

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

Metadata

Publisher
IETF
Doc Type
Informational
Pages
11
Abstract
This document describes a widely deployed hybrid key exchange method in the Secure Shell (SSH) protocol that is based on Streamlined NTRU Prime sntrup761 and X25519 with SHA-512.
Publication Date
2026-04-01
Status Note
Informational
DOI
10.17487/RFC9941
Link
https://doi.org/10.17487/RFC9941
Author(s)
Markus Friedl
Jan Mojzis
Simon Josefsson
Keyword(s)
NTRUPrime, X25519, SSH, Key Exchange, Post-quantum Cryptography, Hybrid Key Exchange
Latest version of IETF RFC 9941

Document Versions — IETF RFC 9941

  • ▶ IETF RFC 9941 (2026-04-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

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Plain text (ISO 690 compliant)

Preview:
IETF RFC 9941, Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512. Available at https://doi.org/10.17487/RFC9941
Snippet:
IETF RFC 9941, Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512. Available at https://doi.org/10.17487/RFC9941

HTML (ISO 690 compliant)

Preview:
IETF RFC 9941, Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512. Available at https://doi.org/10.17487/RFC9941
Snippet:
<span class="citation"><cite>IETF RFC 9941</cite>, Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512. Available at <a href="https://doi.org/10.17487/RFC9941" target="_blank" rel="noopener">https://doi.org/10.17487/RFC9941</a></span>

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Preview:
IETF RFC 9941, Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512
doi: 10.17487/RFC9941
url: https://doi.org/10.17487/RFC9941
Snippet:
<li>
<cite id="bib-rfc9941">IETF RFC 9941</cite>, Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512
<span class="doi">10.17487/RFC9941</span>
</li>

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