journal-of-discrete-mathematical-sciences-and-cryptography Journal of Discrete Mathematical Sciences and Cryptography 2169-0065 0972-0529 Taru Publications 10.47974/JDMSC-1643 Security issues of CFS-like digital signature algorithms D’Alconzo Giuseppe Department of Mathematical Sciences, Corso Duca degli Abruzzi 24, Politecnico di Torino, Torino, 10129, Italy Meneghetti Alessio Department of Mathematics, Universitá di Trento, Via Sommarive 14, Povo (Trento), 38123, Italy Piasenti Paolo Department of Mathematics, Universitá di Trento, Via Sommarive 14, Povo (Trento), 38123, Italy 27 1 175 187 24 01 2024

We analyze the security of some variants of the CFS code-based digital signature scheme. We show how the adoption of some code-based hash functions to improve the efficiency of CFS leads to the ability of an attacker to produce a forgery compatible with the rightful user’s public key.

 Code-based digital signatures CFS Post-quantum cryptography Cryptanalysis access open retracted no