A new Request for Comments is now available in online RFC libraries. RFC 8391 Title: XMSS: eXtended Merkle Signature Scheme Author: A. Huelsing, D. Butin, S. Gazdag, J. Rijneveld, A. Mohaisen Status: Informational Stream: IRTF Date: May 2018 Mailbox: ietf@huelsing.net, dbutin@cdc.informatik.tu-darmstadt.de, ietf@gazdag.de, ietf@joostrijneveld.nl, mohaisen@ieee.org Pages: 74 Characters: 155770 Updates/Obsoletes/SeeAlso: None I-D Tag: draft-irtf-cfrg-xmss-hash-based-signatures-12.txt URL: https://www.rfc-editor.org/info/rfc8391 DOI: 10.17487/RFC8391 This note describes the eXtended Merkle Signature Scheme (XMSS), a hash-based digital signature system that is based on existing descriptions in scientific literature. This note specifies Winternitz One-Time Signature Plus (WOTS+), a one-time signature scheme; XMSS, a single-tree scheme; and XMSS^MT, a multi-tree variant of XMSS. Both XMSS and XMSS^MT use WOTS+ as a main building block. XMSS provides cryptographic digital signatures without relying on the conjectured hardness of mathematical problems. Instead, it is proven that it only relies on the properties of cryptographic hash functions. XMSS provides strong security guarantees and is even secure when the collision resistance of the underlying hash function is broken. It is suitable for compact implementations, is relatively simple to implement, and naturally resists side-channel attacks. Unlike most other signature systems, hash-based signatures can so far withstand known attacks using quantum computers. This document is a product of the Crypto Forum Research Group of the IRTF. INFORMATIONAL: This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce, rfc-dist and IRTF-Announce lists.To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist https://www.irtf.org/mailman/listinfo/irtf-announce For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC