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mjthatch
requested changes
Apr 2, 2026
| 7. return (tree_idx, leaf_idx) | ||
| \end{verbatim} | ||
| \paragraph{Note:} The total digest must encode \texttt{k*a + hsl = 6*22 + 24 = 156} bits. The \texttt{H\_msg\_fors} output length (Section~5.4.2) must be set accordingly: \texttt{roundup((k*a + hsl) / 8) = 20} bytes. This is a correction from the original \texttt{roundup((k*a) / 8) = 17} bytes, which was insufficient for the unified digest. | ||
| \paragraph{Note:} The total XOF output must encode \texttt{C * b + hsl = 18 * 24 + 16 + 22 = 470} bits. |
| tree_idx: array of d tree indices | ||
| leaf_idx: array of d leaf indices | ||
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| 1. ht_offset ← k * a |
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we should derive ht_offset from the same C := roundup(k * 2^b / t) + 7 formula
mjthatch
approved these changes
Apr 16, 2026
| \begin{itemize} | ||
| \item SHRINCS-B (Bitcoin-optimized): Minimizes signature size at the cost of more verification hashes. | ||
| \item SHRINCS-L (Liquid-optimized): Minimizes verification cost at the cost of larger signatures. | ||
| \item SHRINCS-B32 (Ligthing-optimized): Minimizes signature size and increses signature usage at the cost of more verification hashes. |
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It's not Lightning optimized. Basically, it is the parameters set that support 2^32 signatures, and yes, we try not to make grinding too difficult
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Changed section from FORS+C entirely to PORS+FP. Modified all sections that were related to FORS+C.