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Draft SP 800-208: Recommendation for Stateful Hash-Based Signature Schemes

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In this draft recommendation, NIST is proposing to supplement FIPS 186 by approving the use of two stateful hash-based signature schemes: the eXtended Merkle Signature Scheme (XMSS) and the Leighton-Micali Signature system (LMS) as specified in Requests for Comments (RFC) 8391 and 8554, respectively. Stateful hash-based signature schemes are not suitable for general use since they require careful state management in order to ensure their security. However, their use may be appropriate for applications in which use of the private key may be carefully controlled and where there is a need to transition to a post-quantum secure digital signature scheme before the post-quantum cryptography standardization process has completed.

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