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Popularity of group-oriented applications motivates research on security and privacy protection for group communications. A number of group key agreement protocols exploiting ID-based cryptosystem have been proposed for this objective. Though bearing beneficial features like reduced management cost, private key delegation from ID-based cryptosystem, they have not taken into account privacy issues during group communication. In wireless networks, the privacy problem becomes more crucial and urgent for mobile users due to the open nature of radio media.
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