Collisions for Hash Functions MD4, MD5, HAVAL-128 and RIPEMD

MD5 is the hash function designed by Ron Rivest [9] as a strengthened version of MD4[8]. In 1993 Bert den Boer and Antoon Bosselaers [1] found pseudo-collision for MD5 which is made of the same message with two different sets of initial value. H. Dobbertin[3] found another kind of collision which consists of two different 512-bit messages with a chosen initial value I