On Fault Injections in Generalized Feistel Networks

Hélène Le Bouder , Gaël Thomas (1) , Yanis Linge , Assia Tria (2)

1 XLIM - XLIM
2 ERC CEA / EMSE - Équipe de Recherche Commune CEA - EMSE (SESAM : Secured Embedded Systems And Microelectronics)

—In this paper, we propose a generic method to assess the vulnerability to Differential Fault Analysis of generalized Feistel networks (GFN). This method is based on an in-depth analysis of the GFN properties. First the diffusion of faults is studied, both at the block level and at the S-box level, in order to have a fault which maximizes the number of S-boxes impacted by a fault. Then the number of faults in an S-box required to find the key is evaluated. By combining these results, a precise assessment of the vulnerability to fault attacks of GFN can be made. This method is then used on several examples of Feistel ciphers.

Mots clés: Fault injections attack; differential fault analysis; Generalized Feistel Networks

Domaines: Cryptographie et sécurité [cs.CR]

Hélène Le Bouder, Gaël Thomas, Yanis Linge, Assia Tria. On Fault Injections in Generalized Feistel Networks. Workshop on Fault Diagnosis and Tolerance in Cryptography, FDTC 2014, 2014, Busan, South Korea. ⟨hal-01814202⟩