Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Security Weakness of Flexible Group Key Exchange with On-Demand
  Computation of Subgroup Keys   In AFRICACRYPT 2010, Abdalla et al. first proposed a slight modification to
the computations steps of the BD protocol, called mBD+P. Then they extended
mBD+P protocol into mBD+S protocol. In this paper, we show that both of mBD+P
and mBD+S protocols are vulnerable to malicious insiders attack. Further, we
propose a simple countermeasure against this attack.

18
The categories of this paper are: econ
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom