Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cryptanalysis and Improvements on Some Graph-based Authentication
  Schemes   In 2010, Grigoriev and Shpilrain, introduced some graph-based authentication
schemes. We present a cryptanalysis of some of these protocols, and introduce
some new schemes to fix the problems.

4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th