Improved Collision Attacks on MD4 and MD5 Sasaki, Y. ; Naito, Y. ; Kunihiro, N. ; Ohta, K. Abstract Publication: IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences Pub Date: January 2007 DOI: 10.1093/ietfec/e90-a.1.36 Bibcode: 2007IEITF..90...36S