Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collision-resistant hash function based on composition of functions   cryptographic hash function is a deterministic procedure that compresses an
arbitrary block of numerical data and returns a fixed-size bit string. There
exist many hash functions: MD5, HAVAL, SHA, ... It was reported that these hash
functions are not longer secure. Our work is focused in the construction of a
new hash function based on composition of functions. The construction used the
NP-completeness of Three-dimensional contingency tables and the relaxation of
the constraint that a hash function should also be a compression function.

35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph