Shahram Khazaei Simon Fischer 0002 Willi Meier Reduced Complexity Attacks on the Alternating Step Generator. 1-16 2007 conf/sacrypt/2007 Selected Areas in Cryptography http://dx.doi.org/10.1007/978-3-540-77360-3_1 db/conf/sacrypt/sacrypt2007.html#KhazaeiFM07