An Improved Correlation Attack Against Irregular Clocked and Filtered Keystream Generators [chapter]

Håvard Molland, Tor Helleseth
2004 Lecture Notes in Computer Science  
In this paper we propose a new key recovery attack on irregular clocked keystream generators where the stream is filtered by a nonlinear Boolean function. We show that the attack is much more efficient than expected from previous analytic methods, and we believe it improves all previous attacks on the cipher model.
doi:10.1007/978-3-540-28628-8_23 fatcat:3rpfba2wgrew7brigjkcirjwmm