Debojyoti Bhattacharya Nitin Bansal Amitava Banerjee Dipanwita Roy Chowdhury A Near Optimal S-Box Design. 77-90 2007 conf/iciss/2007 ICISS http://dx.doi.org/10.1007/978-3-540-77086-2_7 db/conf/iciss/iciss2007.html#BhattacharyaBBC07