Jung Hee Cheon MunJu Kim Kwangjo Kim Jung-Yeun Lee SungWoo Kang Improved Impossible Differential Cryptanalysis of Rijndael and Crypton. 39-49 2001 conf/icisc/2001 ICISC http://link.springer.de/link/service/series/0558/bibs/2288/22880039.htm db/conf/icisc/icisc2001.html#CheonKKLK01