Author

J. L. Delgado

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Preprint Aug 2026

Full-Key Recovery and Forgery from One MQOM v2.1 Signature

We give a full-key-recovery attack on MQOM v2.1, a Round-3 candidate in the NIST additional-signature process, that recovers the complete signing key from one accepted signature and uses it to sign a fresh message. If $\delta=\operatorname{FirstBits}_{\lambda}(x)$ is the prefix of the witness $x$, the sibling path dete...

J. L. Delgado · 0 citations

Preprint Sep 2026

The Supersingular Isogeny Problem in Time and Memory $p^{1/3+o(1)}$, Unconditionally

Given a supersingular elliptic curve $E/\mathbb{F}_{p^2}$, the $\mathsf{OneEnd}$ problem asks for a non-scalar endomorphism of $E$. By known reductions, solving this problem also solves the supersingular endomorphism ring and isogeny problems. Wesolowski obtained exponent $1/3$ under an assumption on the factorization...

J. L. Delgado · 0 citations