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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。
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