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Cryptographically-enforced hierarchical access control with multiple keys

机译:具有多个密钥的加密强制分层访问控制

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Hierarchical access control policies, in which users and objects are associated with nodes in a hierarchy, can be enforced using cryptographic mechanisms. Protected data is encrypted and authorized users are given the appropriate keys. Lazy re-encryption techniques and temporal hierarchical access control policies require that multiple keys may be associated with a node in the hierarchy. In this paper, we introduce the notion of a multi-key assignment scheme to address this requirement. We define bounded, unbounded, synchronous, and asynchronous schemes. We demonstrate that bounded, synchronous schemes provide an alternative to temporal key assignment schemes in the literature, and that unbounded asynchronous schemes provide the desired support for lazy re-encryption.
机译:可以使用加密机制来强制执行分层访问控制策略,其中用户和对象与分层结构中的节点相关联。受保护的数据被加密,并为授权用户提供适当的密钥。惰性重新加密技术和时间分层访问控制策略要求多个密钥可以与分层结构中的节点关联。在本文中,我们介绍了一种多键分配方案的概念来解决这一要求。我们定义了有界,无界,同步和异步方案。我们证明,有界同步方案为文献中的时间密钥分配方案提供了替代方案,而无界异步方案为延迟重新加密提供了所需的支持。

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