An Braeken Joseph Lano Bart Preneel Evaluating the Resistance of Stream Ciphers with Linear Feedback Against Fast Algebraic Attacks. 40-51 2006 conf/acisp/2006 ACISP http://dx.doi.org/10.1007/11780656_4 db/conf/acisp/acisp2006.html#BraekenLP06