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http://dx.doi.org/10.6109/JKIICE.2009.13.4.675

Symmetry structured RC6 block cipher algorithm  

Kim, Gil-Ho (부경대학교 컴퓨터공학과)
Park, Chang-Soo (부경대학교 컴퓨터공학과)
Kim, Jong-Nam (부경대학교 컴퓨터공학과)
Cho, Gyeong-Yeon (부경대학교 컴퓨터공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.13, no.4, 2009 , pp. 675-683 More about this Journal
Abstract
RC6 which has different algorithm of encryption and decryption has been proposed to have the same algorithm between encryption and decryption through inserting symmetry layer using simple rotate and logical operation. That means the half of whole RC6 round uses encryption algorithm and the rest of it uses decryption one and symmetry layer has been put into the middle of encryption and decryption. The proposed RC6 algorithm has no difference with the original one in the speed of process. However it is quite safe because by inserting symmetry layer the path of high probability which is needed for differential and linear analysis is cut off so that it is hard to be analyzed. The proposed symmetry layer algorithm can be easily applied to the algorithm which has different encryption and decryption and make it same, and it can be good idea to be used to design a new block cipher algorithm.
Keywords
RC6; Feistel; SPN; Symmetry layer; CBC mode;
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