Modification of Edon80 to Resist the Key Recovery Attack

Edon80 is a hardware binary additive synchronous stream cipher submitted to the last phase of the eSTREAM project. The core of the cipher consists of quasigroup string e- transformations and it employs four quasigroups of order 4. The internal structure of Edon80 is highly pipelined, making it scalable from the speed of processing point of view. The best attack on Edon80 is the key recovery attack given by Johansson and Hell. In this paper, we give a modification to the Keystream Mode of Edon80 to resist the key recovery attack, and the modification keep the high parallelizability of Edon80.