Sharma Abhishek Srinivasan Ravi Mukkamala K. Venkataramaniah Design and Anlysis of Cryptographically Strong S-Boxes: A Novel Approach. 124-129 2009 Security and Management conf/csreaSAM/2009 db/conf/csreaSAM/csreaSAM2009.html#SrinivasanMV09