Cryptanalysis of the FSR-255 hash function

In this paper we analyse the security of the FSR-255 cryptographic hash function. As a result of our security analysis we present preimage and second-preimage attacks. The attacks base on practical reversibility of the compression function. The complexity of preimage attack is about 211 evaluations of the compression function. The second-preimage attack has the complexity equivalent to one time evaluation of the compression function. Both of the attacks have been practically realised.