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

Flexible attribute-based proxy re-encryption for efficient data sharing
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灵活的基于属性的代理重新加密,实现高效的数据共享

DOI:
10.1016/j.ins.2019.09.052
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发表时间:
2020-02
影响因子:
8.1
通讯作者:
Yunya Zhou
Yunya Zhou
中科院分区:
计算机科学1区
文献类型:
--
作者:
Hua Deng;Zheng Qin;Qianhong Wu;Zhenyu Guan;Yunya Zhou

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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)是一种很有前途的原语,它允许对要共享的数据实施细粒度的访问控制。ABE中的一个问题是,优先访问策略应该在系统设置或加密阶段确定,但这些策略将随着时间的推移而过时。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)。为了解决这些问题,我们提出了一个新的范例称为混合基于属性的代理重新加密(HAPRE)。在HAPRE中,一个被授权的代理可以被授权将ABE方案的密文转换为基于身份的加密(IBE)方案的密文,而不需要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之前由ABE加密的数据。利用紧致IBE方案和密钥重随机化技术构造了两个HAPRE方案,并证明了这两个方案是语义安全和抗共谋的。理论和实验分析证明了HAPRE方案的有效性。
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 thata prioriaccess 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.
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