SPHINCS+🔒 SSL Verified

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"SPHINCS+ is a stateless hash-based signature scheme, which was submitted to the NIST post-quantum crypto project. The design advances the SPHINCS signature scheme, which was presented at EUROCRYPT 2015. It incorporates multiple improvements, specifically aimed at reducing signature size. For a quick overview of the changes from SPHINCS to SPHINCS+ see the blog post by Andreas Hülsing. The submission proposes three different signature schemes:"

"These signature schemes are obtained by instantiating the SPHINCS+ construction with SHAKE256, SHA-256, and Haraka, respectively."

"The second round submission of SPHINCS+ introduces a split of the above three signature schemes into a simple and a robust variant for each choice of hash function. The robust variant is exactly the SPHINCS+ version from the first round submission and comes with all the conservative security guarantees given before. The simple variants are pure random oracle instantiations. These instantiations achieve about a factor three speed-up compared to the robust counterparts. This comes at the cost of a purely heuristic security argument."

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