Baudoin Collard François-Xavier Standaert Jean-Jacques Quisquater Improving the Time Complexity of Matsui's Linear Cryptanalysis. 77-88 2007 conf/icisc/2007 ICISC http://dx.doi.org/10.1007/978-3-540-76788-6_7 db/conf/icisc/icisc2007.html#CollardSQ07