rfc9858v4.txt   rfc9858.txt 
Internet Research Task Force (IRTF) S. Fluhrer Internet Research Task Force (IRTF) S. Fluhrer
Request for Comments: 9858 Cisco Systems Request for Comments: 9858 Cisco Systems
Category: Informational Q. Dang Category: Informational Q. Dang
ISSN: 2070-1721 NIST ISSN: 2070-1721 NIST
September 2025 October 2025
Additional Parameter Sets for HSS/LMS Hash-Based Signatures Additional Parameter Sets for HSS/LMS Hash-Based Signatures
Abstract Abstract
This document extends HSS/LMS (RFC 8554) by defining parameter sets This document extends HSS/LMS (RFC 8554) by defining parameter sets
that use alternative hash functions. These include hash functions that use alternative hash functions. These include hash functions
that result in signatures with significantly smaller sizes than the that result in signatures with significantly smaller sizes than the
signatures that use the RFC 8554 parameter sets and should have signatures that use the RFC 8554 parameter sets and should have
sufficient security. sufficient security.
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