Security Weakness of Flexible Group Key Exchange with On-Demand Computation of Subgroup Keys

Details Security Weakness of Flexible Group Key Exchange with On-Demand Computation of Subgroup Keys Security Weakness of Flexible Group Key Exchange with On-Demand Computation of Subgroup Keys

2010-08-06

arxiv.org/abs/1008.1221v1

Computer Science

Cryptography and Security

Scientific paper

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.

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