Simon Fischer 0002 Shahram Khazaei Willi Meier Chosen IV Statistical Analysis for Key Recovery Attacks on Stream Ciphers. 236-245 2008 AFRICACRYPT http://dx.doi.org/10.1007/978-3-540-68164-9_16 conf/africacrypt/2008 db/conf/africacrypt/africacrypt2008.html#FischerKM08