Research On Differential Analysis Method Of ZORRO Algorithm

The information security has played a more and more important role in the development of security.Cryptography is the cornerstone of information security,which has received extensive attention from the academic community.Since the ZORRO was proposed,a lot of people have analyzed it.For example,Wu Wenling et.al found that the 4 order matrix of the MDS matrix used in ZORRO was equal to the identity matrix,and according to which,they evaluate the security of ZORRO against linear attacks and differential attacks.While Achiya Bar-On,Itai Dinur et.al introduced the linear analysis and differential analysis of several block cipher algorithms which contain SP structure,including ZORRO.Based on the above research,this paper makes a detailed study of the differential analysis of ZORRO and use the algebraic method to recover the part of the key on account of the iterative property of ZORRO.Then we try to find a truncated differential-linear analysis path.This paper mainly does the following work:1.We analyses ZORRO with differential analysis method,and use the algebraic method to recover the part of the key on account of the iterative difference of ZORRO.2.According to the principle of truncation differential-linear analysis,we find an 8-round truncated differential-linear analysis path.This paper has two innovation points as below:1.Use the algebraic methods to recover some bits of the key of ZORRO.Based on the 19-round iterative differential path,we analyze the 24-round differential analysis of ZORRO.Results show that we can use simple equations to recover some bits of the key intuitively.In addition,the method does not increase the complexity.2.On the basis of the 4-round linear path of ZORRO,we find a matched 4-round differential path,and avoid the omission.Then,connect the linear path with the differential path we found to make it be an 8-round truncated difference-linear path.