On Tweaking Dual MISTY-TYPE Blockciphers

摘要：

Tweakable blockciphers are blockciphers with an additional input, the tweak, that is used to provide variation, but is not kept secret. An open problem proposed by Liskov et al.is how to construct tweakable blockciphers without using a preexisting blockcipher. In this paper, on the basis of four round Dual MISTY-TYPE transformations, we propose a tweakable blockcipher directly and solve the above open problem. The new scheme is provable security if the underlying block cipher is a pseudorandom permutation. At the same time, we point out that there is no secure tweakable blockcipher on the basis of three round Dual MISTY-TYPE transformations.

关键词： block cipher tweakable block cipher MISTY-TYPE structure

作者: Fengtong Wen Lizi Yin

会议类型: 国际会议

会议名称: 2009 2nd IEEE International Conference on Computer Science and Information Technology(第二届计算机科学与信息技术国际会议 ICCSIT2009)

会议地点: 北京

会议语种:英文

页码: 942-944

在线出版日期: 2009-08-08（万方平台首次上网日期，不代表论文的发表时间）