Edon80 is a recent stream cipher design that has advanced to the third and last phase of the eSTREAM project. It has remained unbroken and untweaked since it was designed and submitted to eSTREAM. It is now one of the 8 nal hardware candidates. In this paper we cryptanalyze the cipher by describing a key recovery attack. The complexity of the attack is around 269 simple operations for a keystream of similar length.