Improved Identity-Based Online/Offline Encryption
Improved Identity-Based Online/Offline Encryption
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DOI：
10.1007/978-3-319-19962-7_10
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Jianchang Lai;Y. Mu;Fuchun Guo;W. Susilo
中科院分区：
文献类型：
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作者：
Jianchang Lai;Y. Mu;Fuchun Guo;W. Susilo
线上/线下加密的概念是由Guo，Mu和Chen(FC 2008)提出的，他们在其中提出了一种基于身份的方案，称为基于身份的线上/线下加密(IBOOE)。在线/离线加密将加密分为两个阶段：离线和在线。离线阶段比在线阶段承载更多的计算负载，在在线阶段，离线阶段不需要加密消息的信息和接收者的身份。随后，在文献中提出了IBOOE的许多应用。例如，Hobenberger和Waters(PKC 2014)最近将其应用于基于属性的加密。在这篇文章中，我们更进一步，探索一种更有效的变体。我们提出了一种有效的半类属变换，从传统的基于身份的加密(IBE)中获得在线/离线加密。我们的变换提供了一种新的方法，将接收者身份的计算分为离线和在线两个阶段。在身份计算中，与其他IBOOE方案相比，使用我们的变换的IBOOE方案在离线和在线阶段都节省了一个群元素。转换后的方案仍保持与原始IBE方案相同的安全级别。
The notion of online/offline encryption was put forth by Guo, Mu and Chen (FC 2008), where they proposed an identity-based scheme calledidentity-based online/offline encryption(IBOOE). An online/offline encryption separates an encryption into two stages: offline and online. The offline phase carries much more computational load than the online phase, where the offline phase does not require the information of the message to be encrypted and the identity of the receiver. Subsequently, many applications of IBOOE have been proposed in the literature. As an example, Hobenberger and Waters (PKC 2014) have recently applied it to attribute-based encryption. In this paper, we move one step further and explore a much more efficient variant. We propose an efficient semi-generic transformation to obtain an online/offline encryption from a tradition identity-based encryption (IBE). Our transformation provides a new method to separate the computation of receiver’s identity into offline and online phases. The IBOOE schemes using our transformation saves one group element in both offline and online phases compared to other IBOOE schemes in identity computing. The transformed scheme still maintains the same level of security as in the original IBE scheme.