Defending against key exposure in attribute-based encryption
Defending against key exposure in attribute-based encryption
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DOI：
10.1504/ijahuc.2014.065156
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
J. Li;X. Chen;H. Tian;C. Gao
中科院分区：
文献类型：
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作者：
J. Li;X. Chen;H. Tian;C. Gao
自基于属性的加密（ABE）概念提出以来，它已经在细粒度访问控制等方面得到了广泛的应用。然而，ABE中的密钥暴露问题已经完全解决。这个问题是正式解决和制定本文。更具体地说，我们提出了一个新的密钥绝缘ABE（KI-ABE）计划作为解决方案的关键暴露问题。给出了KI-ABE的定义和安全模型。在此基础上，提出了一个KI-ABE方案，并证明了该方案在该模型下是安全的。该方案是安全的，在剩余的时间内对对手谁妥协的不安全的设备，并获得其选择的期间的秘密密钥。最后，我们表明，该计划还支持用户委托，这是至关重要的，当一个人想要委托的属性（特权）的一部分给别人。
Since the notion of attribute-based encryption (ABE) was proposed, it has been found a lot of important applications such as fine-grained access control. However, the issue of key exposure problem in ABE has been solved completely. This problem is formally addressed and formulated in this paper. More specifically, we propose a new key-insulated ABE (KI-ABE) scheme as a solution to the key exposure problem. The definition and security model of KI-ABE is proposed. Then, a KI-ABE scheme is presented, which is provably secure under the proposed model. The scheme is secure in the remaining time periods against an adversary who compromises the insecure device and obtains secret keys for the periods of its choice. Finally, we show that the scheme also supports user delegation, which is critical when one wants to delegate part of attributes (privileges) to others.