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Questions tagged [one-time-signature]

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Why does WOTS+ need a checksum during signing operation?

I was reviewing WOTS+ scheme for consideration in our private blockchain, and noticed that it had a small overhead of calculating a checksum as seen in the following pseudocode excerpt from the ...
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1answer
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Bitmasks or seed along with public key in WOTS+ post-quantum signatures

The state of the art hash-based post-quantum signature schemes, like Sphincs and XMSS, are using variations of WOTS (Winternitz OTS), like WOTS+, that require extra random bitmasks along with the ...
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Winternitz One-Time Signature

I am reading the page 38 in this "Post Quantum Cryptography" book (Equations 8 and 9). My question is, why to compute the verification key $Y$, $f$ is applied $2^w-1$ times? Are there any security ...