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<div dir="ltr"><div>Hi,</div><div><br></div><div>This NIST SP800-230 spec updates with optimized parameter sets (i.e., faster execution)</div><div>for FIPS 205 (SLH-DSA) with tradeoffs of less total signatures (still very useful for things</div><div>like firmware updates).</div><div><br></div><div>This is the initial public draft. It's likely that the next release will be the final standard.</div><div><br></div><div>Cheers,</div><div>- Ira</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>From: <b class="gmail_sendername" dir="auto">'<a href="mailto:dustin...@nist.gov">dustin...@nist.gov</a>' via pqc-forum</b> <span dir="auto"><<a href="mailto:pqc-forum@list.nist.gov">pqc-forum@list.nist.gov</a>></span><br>Date: Mon, Apr 13, 2026 at 11:22 AM<br>Subject: [pqc-forum] Call for comments: ipd SP 800-230: Additional SLH-DSA Parameter Sets for Limited Signature Use Cases<br>To: pqc-forum <<a href="mailto:pqc-forum@list.nist.gov">pqc-forum@list.nist.gov</a>><br></div><br><br>All,<div><br></div><div><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px">NIST is seeking public comments on the initial public draft (ipd) of <a href="https://csrc.nist.gov/pubs/sp/800/230/ipd" target="_blank">Special Publication (SP) 800-230, <i style="box-sizing:inherit">Additional SLH-DSA Parameter Sets for Limited-Signature Use Cases</i></a>. This document serves as a technical extension to <a href="https://csrc.nist.gov/pubs/fips/205/final" target="_blank">FIPS 205</a> by specifying six additional parameter sets for security levels 1, 3, and 5. These variants are specifically tailored for use cases that require fast verification and reduced signature sizes, such as the signing of software, firmware, and digital certificates. These optimizations are achieved by establishing a strict limit of 2^24 signatures per signing key; therefore, these sets are not approved for general-purpose use.<span style="box-sizing:inherit"></span></p><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px"><span style="box-sizing:inherit"> </span></p><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px">NIST requests feedback on the suitability of these additional parameter sets, specifically asking reviewers to identify applications for which these variants might incur unacceptable performance or to suggest alternative sets that are better suited for such use cases. Users must perform a thorough evaluation to ensure that the signature limit is never exceeded during a key's lifetime. Please submit comments to <a href="mailto:SP800-230-comments@nist.gov" style="box-sizing:inherit;background-color:transparent;color:rgb(17,75,115);text-decoration-line:underline" target="_blank">SP800-230-comments@nist.gov</a> by June 12, 2026.</p><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px">See: <a href="https://csrc.nist.gov/pubs/sp/800/230/ipd" target="_blank">https://csrc.nist.gov/pubs/sp/800/230/ipd</a></p><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px"><br></p><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px">Dustin Moody</p><p style="box-sizing:inherit;margin:0px 0px 12px;color:rgb(27,27,27);font-family:"Source Sans Pro",Helvetica,Arial,sans-serif;font-size:16px">NIST PQC</p></div>
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