## CryptoDB

### Meltem Sönmez Turan

#### Publications

Year
Venue
Title
2015
EPRINT
2015
EPRINT
2015
EPRINT
2015
CHES
2015
FSE
2010
EPRINT
Hamsi is one of the second round candidates of the SHA-3 competition. In this study, we present non-random differential properties for the compression function of the hash function Hamsi-256. Based on these properties, we first demonstrate a distinguishing attack that requires a few evaluations of the compression function and extend the distinguisher to 5 rounds with complexity $2^{83}$. Then, we present a message recovery attack with complexity of $2^{10.48}$ compression function evaluations. Also, we present a pseudo-preimage attack for the compression function with complexity $2^{254.25}$. The pseudo-preimage attack on the compression function is easily converted to a pseudo second preimage attack on Hamsi-256 hash function with the same complexity.

CHES 2016

#### Coauthors

Çagdas Çalik (1)
Magnus Gausdal Find (1)
John Kelsey (2)
Kerry A. McKay (2)
René Peralta (1)
Daniel Smith-Tone (1)