Discussion Of Fault Attacks To MICKEY

Mickey (Mutual Irregular Clocking KEY) is one of the final winner algorithms in the project of E-STREAM which was designed by Steve Babbage and Matthew Dodd, and was developed to Mickey2.0 and Mickey-128. As the algorithm is designed to be simple and easy hardware implementation, Mickey has been widely concerned in cryptography.This paper analysis the weakness of Mickey, use the fault attacks, proposes a new scheme of fault attack to Mickey-128. the main contributions are as follows.(l)With analyzing Mickey-128 we find out te weakness when it attacked with fault attack: CONTROL bit of the register R is an instrument in changing state, but it do not affect the stream key, so security of the putout-function is reduced; the boolean-function that can change the internal state meybe reversible, so complexity of changeing the internal state is reduced.(2)We imitate the scheme of fault attack with sofeware, and prove its probability, and efficiency.We have conclusion as follow: When we induct 640 fault and have 960 stream key, we can find the initial state of register R and S, and find the all stream key. When we induct 416 fault and have 12480 stream key, we can find the key-seed K and the initialization variable IV.