Journal of Computer Applications

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Research of batch rekeying based on queue model

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  • Received:2008-10-24 Revised:2008-12-02 Online:2009-04-01 Published:2009-04-01
  • Contact: Hui LI

基于队列模型的批量更新密钥的研究

李辉 吴跃 龚海刚   

  1. 电子科技大学 电子科技大学计算机科学与工程学院
  • 通讯作者: 李辉

Abstract: In order to offer secrecy for multicast applications, the traffic encryption key has to be changed whenever a user joins or leaves the system. At present, many approaches based upon individual rekeying bring about the out-of-sync and inefficient problems. The paper proposed the batch rekeying based on queue model, which it would rekey when request to live reached zero by setting request to live to the first rekeying request in the queue. The results of analysis and experiment show that it can not only alleviate the out-of-sync and inefficient problems in the individual rekeying, but also decrease key server's rekeying cost and has better flexibility when compared with batch rekeying based on fixed period.

Key words: multicast, rekeying interval, batch rekeying, queue model

摘要: 为了提供安全组播,当用户加入或者离开系统,通信加密密钥即组密钥就必须改变。但由于目前提出的独立更新密钥方式带来低效和不同步问题,提出了一种基于队列模型的批量更新密钥方法,通过给缓存队列中队首的更新请求设置生存时间,生存时间减小到0时,更新队列中缓存的更新请求。分析和实验表明,该方法不仅缓解了独立更新方式存在的不同步和低效问题,而且相比固定周期批量更新密钥的方式,降低了通信加密密钥的代价,而且有较好的灵活性。

关键词: 组播, 更新间隔, 批量更新, 队列模型

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