Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stream cipher based on quasigroup string transformations in $Z_p^*$   In this paper we design a stream cipher that uses the algebraic structure of
the multiplicative group $\bbbz_p^*$ (where p is a big prime number used in
ElGamal algorithm), by defining a quasigroup of order $p-1$ and by doing
quasigroup string transformations. The cryptographical strength of the proposed
stream cipher is based on the fact that breaking it would be at least as hard
as solving systems of multivariate polynomial equations modulo big prime number
$p$ which is NP-hard problem and there are no known fast randomized or
deterministic algorithms for solving it. Unlikely the speed of known ciphers
that work in $\bbbz_p^*$ for big prime numbers $p$, the speed of this stream
cipher both in encryption and decryption phase is comparable with the fastest
symmetric-key stream ciphers.

20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg