The security of OFT scheme is the emphasis. The vulnerabilities of OFT scheme in forward and backward security are unveiled and some improvements are given.
本文重点分析了OFT方案的安全性，指出了OFT方案在实现前向安全和后向安全上存在的漏洞，并提出了改进方案。
参考来源 - 多播安全中几个关键问题的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Both the refreshed key chain and the identity chain are of backward security.
该方案更新的密钥链是后向安全的，参与者提供的身份链也是后向安全的。
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。
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