Research On Differential Power Analysis And Differential Fault Analysis For AES

With encryption algorithm constantly updated,the methods to decipher encryption algorithm are more and more,in the industry,Advanced Encryption Standard algorithm has been widely used,and Differential Attacks have proven to be a very effective way to attack AES.This paper focuses on two differential attacks against AES,they are Differential Power Analysis attack and Differential Fault Analysis Attack,and on basis of researchs and discusses,propose some new improvements.Differential Power Analysis attack is a most efficient attack to encryption device.Some existing DPA methods have high demands for differential informations and their stabilitys are not strong.In this paper based on the analysis of DPA,authors reconstruct the model of DPA,which can reduce the complexity of attack,and improve the avilability.Combine the researchs of algebra analysis and design principles of AES S-box,deduced S-box and inverse S-box algebraic expression,with the help of algebraic expression,a new DPA attack combining new power model based on algebraic expression has been proposed,experimental results show that the proposed DPA attack has the advantages of increasing the correctness of attacking without increasing the time complexity and reducing the number of the needed differential informations compared with the existing method.Differential Fault Analysis attacks base on injecting some error informations into encryption algorithm,constructing differential fault processing model to decipher encryption algorithm.Some existing DFA methods need complex differential processing models and large searching space.Basis on the analysis of DFA,authors construct S-Box and InvS-Box distribution table which can reduce the searching space and improve efficiency of DFA.With the help of InvS-Box distribution table,this paper proposes error-known and error-random DFA attack models,which have simple differential processing models,less differential informations and smaller searching space compare with the existing DFA.