Concerning nodes' free joining and leaving the group, group key renewing protocol was proposed, which could guarantee the forward security and backward security of the group key.
针对普适环境中节点随时加入和退出群组的特点，设计了组密钥更新协议，保证了组密钥的前向和后向安全性。
While moderately expert users were unlikely to have a problem, from a security standpoint, InformationWeek found Firefox 3 a step backward.
可是较为专业的用户在安全问题上可并不想有任何问题，这是信息周发现的火狐3的退步。
While moderately expert users were unlikely to have a problem, from a security standpoint, InformationWeek found Firefox 3 a step backward.
可是较为专业的用户在安全问题上可并不想有任何问题，这是信息周发现的火狐3的退步。
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