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Self-healing Key Distribution Schemes with Sponsorization

机译：具有保证化的自愈关键分配计划

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In a self-healing key distribution scheme a group manager enables a large and dynamic group of users to establish a group key over an unreliable network. The group manager broadcasts in every session some packet of information in order to provide a common key to members of the session group. The goal of self-healing key distribution schemes is that, even if the broadcast is lost in a certain session, the group member can recover the key from the broadcast packets received before and after the session. This approach to key distribution is quite suitable for wireless networks, mobile wireless ad-hoc networks and in several Internet-related settings, where high security requirements need to be satisfied. In this work we provide a generalization of previous definitions in two aspects. The first one is to consider general structures instead of threshold ones to provide more flexible performance to the scheme. The second one is to consider the possibility that a coalition of users sponsor a user outside the group for one session: we give the formal definition of self-healing key distribution schemes with sponsorization, some bounds on the required amount of information. We also give a general construction of a family of self-healing key distribution schemes with sponsorization by means of a linear secret sharing scheme. Our construction differs from previous self-healing key distribution schemes in the fact that the length of the broadcast is almost constant. Finally we analyze the particular case of this general construction when Shamir's secret sharing scheme is used.
机译：在自我修复密钥分配方案中，组管理器使大型和动态的用户组能够在不可靠的网络上建立组密钥。组经理在每个会话中广播某些信息数据包，以便为会话组成员提供公共密钥。自我修复密钥分发计划的目标是，即使在某个会话中丢失广播，组成员也可以从会话之前和之后收到的广播数据包中恢复密钥。这种对关键分布的方法非常适合无线网络，移动无线ad-hoc网络以及多种与互联网相关的设置，其中需要满足高安全性要求。在这项工作中，我们在两个方面提供了先前定义的概括。第一个是考虑一般结构而不是阈值阈值，为该方案提供更灵活的性能。第二个是考虑用户联盟的可能性赞助一届会议外部的用户：我们给出了许可证的自我修复关键分配计划的正式定义，一些界限所需的信息。我们还通过线性秘密共享方案提供了一系列自我修复关键分配计划的一般建设。我们的施工与先前的自我修复密钥分配方案不同，广播的长度几乎是恒定的事实。最后，当使用Shamir的秘密共享方案时，我们分析了这种一般施工的特定情况。

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