Preimage Attacks on Reduced Steps of ARIRANG and PKC98-Hash

摘要

In this paper, we present the preimage attacks on step-reduced ARIRANG and PKC98-Hash. Our attacks find the preimages of 35 steps out of 40 steps of ARIRANG and 80 steps out of 96 steps of PKC98-Hash, faster than the brute force attack. We applied recently developed techniques of preimage attack. Our attack for ARIRANG is the improvement of the previous attack, and our attack for PKC98-hash is the first analysis result of its preimage resistance.