Lawrence Brown Matthew Kwan Josef Pieprzyk Jennifer Seberry Improving Resistance to Differential Cryptanalysis and the Redesign of LOKI. 36-50 1991 conf/asiacrypt/1991 ASIACRYPT db/conf/asiacrypt/asiacrypt91.html#BrownKPS91 http://dx.doi.org/10.1007/3-540-57332-1_3