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In RFC 8554 "Leighton-Micali Hash-Based Signatures", in section 4.3, the generation of the public key is described. The iterative hash function inputs is $I \| u32str(q) \| u16str(i) \| u8str(j) \| tmp$, where $tmp$ is the iterative element with initial value $x[i]$, the private key associated wi...
