Attacking the combination generator

Frédéric Didier (1) , Yann Laigle-Chapuy (2)

1 ALGO - ALGO
2 SECRET - Security, Cryptology and Transmissions

We present one of the most efficient attacks against the combination generator. This attack is inherent to this system as its only assumption is that the filtering function has a good autocorrelation. This is usually the case if the system is designed to be resistant to other kinds of attacks. We use only classical tools, namely vectorial correlation, weight 4 multiples and Walsh transform.

Domaines: Cryptographie et sécurité [cs.CR]

Frédéric Didier, Yann Laigle-Chapuy. Attacking the combination generator. 2009. ⟨hal-00401908v2⟩