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Flexible attribute-based proxy re-encryption for efficient data sharing

机译:基于灵活的基于属性的代理重新加密,以实现高效的数据共享

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摘要

An increasing number of people are sharing their data through third-party platforms. Attribute-based encryption (ABE) is a promising primitive that allows enforcing fine-grained access control on the data to be shared. An issue in ABE is that a priori access policies should be determined during the system setup or encryption phase, but these policies will become obsolete over time. Another issue is that the decryption of ABE generally requires complicated and expensive computations, which may be unaffordable for resource-limited users (e.g., mobile-device users). To address these issues, we propose a new paradigm called hybrid attribute-based proxy re-encryption (HAPRE). In HAPRE, a semitrusted proxy can be authorized to convert ciphertexts of an ABE scheme into ciphertexts of an identity-based encryption (IBE) scheme without letting the proxy know the underlying messages. With these features, HAPRE enables resource-limited users to efficiently access the data previously encrypted by ABE. We construct two HAPRE schemes by utilizing a compact IBE scheme and a key rerandomization technique, and then we prove that the schemes are semantically secure and collusion resistant. Theoretical and experimental analyses demonstrate the efficiency of the HAPRE schemes. (C) 2019 Elsevier Inc. All rights reserved.
机译:越来越多的人通过第三方平台分享他们的数据。基于属性的加密(ABE)是一个有希望的原始原始原始原语,允许在要共享的数据上强制执行细粒度访问控制。 ABE中的一个问题是应在系统设置或加密阶段确定先验的访问策略,但这些策略将随时间过时。另一个问题是,ABE的解密通常需要复杂且昂贵的计算,这对于资源有限的用户(例如,移动设备用户)可能无法实现。要解决这些问题,我们提出了一种名为混合属性的代理重新加密(HAPRE)的新范式。在HAPRE中,可以授权半批准代理将ABE方案的密文转换为基于身份的加密(IBE)方案的密文,而不会让代理知道底层消息。通过这些功能,HAPRE使资源有限的用户能够有效地访问先前通过ABE加密的数据。我们通过利用Compact IBE方案和关键的RERANDOMIZ化技术来构建两个HAPRE方案,然后我们证明这些方案是语义安全和抗菌的抗性。理论和实验分析证明了Hapre方案的效率。 (c)2019 Elsevier Inc.保留所有权利。

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