With the succumbing of various Hash functions to collision attacks, there have been serious research efforts to design new Hash functions which are robust against various contemporary attacks. MAYHAM is one such hash function that has been designed keeping in view the cryptographic properties needed yet resistant to all the publically known attacks. MAYHAM is designed as a simple and efficient ...

Recent advances in hash functions cryptanalysis provide a strong impetus to explore new designs. This paper describes a new hash function mq-hash that depends for its security on the difficulty of solving randomly drawn systems of multivariate equations over a finite field. While provably achieving pre-image resistance for a hash function based on multivariate equations is relatively easy, näıv...

SHA-3 Cryptographic Hash Algorithm Competition is a competition raised by NIST in response to recent advances of cryptanalysis, aiming at selecting new hash algorithm instead of SHA-2 like AES selection. The compression function of a hash function could be written in the form of multivariate boolean function. In this paper, we introduce our algorithms of evaluating boolean function and applied ...

A cryptographic hash function is a deterministic procedure that compresses an arbitrary block of numerical data and returns a fixed-size bit string. There exists many hash functions: MD5, HAVAL, SHA, ... It was reported that these hash functions are no longer secure. Our work is focused on the construction of a new hash function based on composition of functions. The construction used the NP-co...

A “strong” cryptographic hash function suitable for practical applications should simultaneously satisfy many security properties, like pseudo-randomness, collision resistance and unforgeability. This paper shows how to combine two hash function families each satisfying different security property into one hash function family, which satisfies both properties. In particular, given two hash func...

In the conference PKC’98, Shin et al. proposed a dedicated hash function of the MD family. In this paper, we study the security of Shin’s hash function. We analyze the property of the Boolean functions, the message expansion, and the data dependent rotations of the hash function. We propose a method for finding the collisions of the modified Shin’s hash function and show that we can find collis...

Recently, Shoichi Hirose [2] proposed several double block length (DBL) hash functions. Each DBL hash function uses a constant which has a role to make the DBL hash function collision-resistant in the ideal cipher model. However, we have to instantiate a block cipher. In this paper, we show that the constant may be used as a trapdoor to help a attacker to find a collision easily. In case of 256...

Vulnerability of dedicated hash functions to various attacks has made the task of designing hash function much more challenging. This provides us a strong motivation to design a new cryptographic hash function viz. HF-hash. This is a hash function, whose compression function is designed by using first 32 polynomials of HFE Challenge-1 [8] with 64 variables by forcing remaining 16 variables as z...

Collisions in the LPS cryptographic hash function of Charles, Goren and Lauter have been found by Zémor and Tillich [16], but it was not clear whether computing preimages was also easy for this hash function. We present a probabilistic polynomial time algorithm solving this problem. Subsequently, we study the Morgenstern hash, an interesting variant of LPS hash, and break this function as well....

In this paper, a new way to construct cryptographic hash function is given. The cryptographic hash function is generalized to uncertain function which has various specific function forms. When computing hash value, the specific form of the function is determined by the message, but the codebreaker cannot know the message, and hence cannot know the specific form of random function. This provides...