Carsten Rolfes Axel Poschmann Gregor Leander Christof Paar Ultra-Lightweight Implementations for Smart Devices - Security for 1000 Gate Equivalents. 89-103 2008 CARDIS http://dx.doi.org/10.1007/978-3-540-85893-5_7 conf/cardis/2008 db/conf/cardis/cardis2008.html#RolfesPLP08