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Securely Outsourcing Attribute-Based Encryption with Checkability

机译：具有可检查性的安全外包基于属性的加密

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摘要

Attribute-Based Encryption (ABE) is a promising cryptographic primitive which significantly enhances the versatility of access control mechanisms. Due to the high expressiveness of ABE policies, the computational complexities of ABE key-issuing and decryption are getting prohibitively high. Despite that the existing Outsourced ABE solutions are able to offload some intensive computing tasks to a third party, the verifiability of results returned from the third party has yet to be addressed. Aiming at tackling the challenge above, we propose a new Secure Outsourced ABE system, which supports both secure outsourced key-issuing and decryption. Our new method offloads all access policy and attribute related operations in the key-issuing process or decryption to a Key Generation Service Provider (KGSP) and a Decryption Service Provider (DSP), respectively, leaving only a constant number of simple operations for the attribute authority and eligible users to perform locally. In addition, for the first time, we propose an outsourced ABE construction which provides checkability of the outsourced computation results in an efficient way. Extensive security and performance analysis show that the proposed schemes are proven secure and practical.
机译：基于属性的加密（ABE）是一种很有前途的加密原语，可以极大地增强访问控制机制的多功能性。由于ABE策略的高表达能力，ABE密钥发布和解密的计算复杂度越来越高。尽管现有的外包ABE解决方案能够将一些繁重的计算任务转移给第三方，但是从第三方返回的结果的可验证性尚待解决。为了解决上述挑战，我们提出了一个新的安全外包ABE系统，该系统同时支持安全外包密钥发布和解密。我们的新方法将密钥发布或解密过程中的所有与访问策略和属性相关的操作分别转移给密钥生成服务提供者（KGSP）和解密服务提供者（DSP），仅对属性保留了恒定数量的简单操作授权和合格用户在本地执行。此外，我们首次提出了外包ABE构造，该构造以有效的方式提供了外包计算结果的可检查性。广泛的安全性和性能分析表明，提出的方案已被证明是安全和实用的。

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