Miia Hermelin Joo Yeon Cho Kaisa Nyberg Multidimensional Linear Cryptanalysis of Reduced Round Serpent. 203-215 2008 ACISP http://dx.doi.org/10.1007/978-3-540-70500-0_15 conf/acisp/2008 db/conf/acisp/acisp2008.html#HermelinCN08