Ramesh Karri Grigori Kuznetsov Michael Gössel Parity-Based Concurrent Error Detection of Substitution-Permutation Network Block Ciphers. 113-124 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2779&spage=113 2003 conf/ches/2003 CHES db/conf/ches/ches2003.html#KarriKG03