FuLeakage: Breaking FuLeeca by Learning Attacks

ePrint Report: FuLeakage: Breaking FuLeeca by Learning Attacks

Felicitas Hörmann, Wessel van Woerden

FuLeeca is a signature scheme submitted to the recent NIST call for additional signatures. It is an efficient hash-and-sign scheme based on quasi-cyclic codes in the Lee metric and resembles the lattice-based signature Falcon. FuLeeca proposes a so-called concentration step within the signing procedure to avoid leakage of secret-key information from the signatures. However, FuLeeca is still vulnerable to learning attacks, which were first observed for lattice-based …

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