Update on Tiger

Tiger is a cryptographic hash function with a 192-bit hash value which was proposed by Anderson and Biham in 1996. At FSE 2006, Kelsey and Lucks presented a collision attack on Tiger reduced to 16 (out of 24) rounds with complexity of about 2. Furthermore, they showed that a pseudo-near-collision can be found for a variant of Tiger with 20 rounds with complexity of about 2. In this article, we show how their attack method can be extended to construct a collision in the Tiger hash function reduced to 19 rounds. We present two different attack strategies for constructing collisions in Tiger-19 with complexity of about 2 and 2. Furthermore, we present a pseudo-near-collision for a variant of Tiger with 22 rounds with complexity of about 2.