[Resource Topic] 2025/133: Cryptanalysis of an Efficient Signature Based on Isotropic Quadratic Forms

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Title:
Cryptanalysis of an Efficient Signature Based on Isotropic Quadratic Forms

Authors: Henry Bambury, Phong Q. Nguyen

Abstract:

We present a key-recovery attack on DEFI, an efficient signature scheme proposed recently by Feussner and Semaev, and based on isotropic quadratic forms, borrowing from both multivariate and lattice cryptography.
Our lattice-based attack is partially heuristic, but works on all proposed parameters: experimentally, it recovers the secret key in a few minutes, using less than ten (message,signature) pairs.

ePrint: https://eprint.iacr.org/2025/133

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