Jorge Nakahara Jr. Gautham Sekar Daniel Santana de Freitas Chang Chiann Ramon Hugo de Souza Bart Preneel A New Approach to <i>chi</i><sup>2</sup> Cryptanalysis of Block Ciphers. 1-16 2009 ISC http://dx.doi.org/10.1007/978-3-642-04474-8_1 conf/isw/2009 db/conf/isw/isc2009.html#NakaharaSFCSP09