标题：Differential Cryptanalysis of Blow-CAST-Fish
作者：Sun, Xiaoling; Wang, Meiqin
作者机构：[Wang, Meiqin] Shandong Univ, Key Lab Cryptol Technol & Informat Secur, Minist Educ, Jinan 250100, Peoples R China.; [Sun, Xiaoling] Inst Disaster P 更多
会议名称：International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering (CISSE)
会议日期：DEC 04-12, 2009
来源：TECHNOLOGICAL DEVELOPMENTS IN NETWORKING, EDUCATION AND AUTOMATION
摘要：Blow-CAST-Fish is a sixteen-round Feistel cipher in which the F function is a part of the private key. In this paper, we show that the disclosure of F allows perform a differential cryptanalysis against a number of rounds. We firstly identify the properties of F function with three active S-boxes to construct the 6-round differential characteristic with the probability 2(-61) and the differential weak keys occur with the probability 2(-12). Then we identify the properties of F function with only one active S-box to construct the 14-round differential characteristic with the probability 2(-49) and the differential weak keys occur with the probability 2(-52). With the above differential characteristics, we can attack 8-round and 16-round Blow-CAST-Fish respectively.