RACE integrity primitives evaluation message digest (RIPEMD)

RACE Integrity Primitives Evaluation Message Digest (RIPEMD) are hash functions developed by Hans Dobbertin, Anton Bosselaers and Bart Preneel as part of the European RIPE project and are based on a modified MD4 algorithm. The modification of the algorithm mainly concerns the order and rotation of the information, which makes it much more secure than the MD4 algorithm. There are several RIPEMD versions with hash values of different lengths of 128 bits, 160 bits, 256 bits and 320 bits.

RIPEMD-128 uses transmission blocks with block lengths of 512 bits and a hash value of 128 bits, but this is too low for today's security requirements.

RIPEMD-160 corresponds to RIPEMD-128 in block length with 512 bits, but is characterized by high security due to the 160-bit hash value. RIPEMD-160 is widely used and secure against cryptographic attacks.