We propose an attribute-based fast data cloud-outsourcing (FDCO) scheme, which shows great performance in mobile devices. Technically, this work is a CCA-secure online/offline key encapsulation scheme based on ciphertext-policy attribute-based encryption with public validity test and indirect user revocation mechanism. We adapt it to a mobile cloud-outsourcing scenario and present a concrete system. Our scheme is equipped with the following desirable properties: First, encapsulation needs only several lightweight online modular addition/multiplication operations, which is appealing to mobile users. Second, it is equipped with an efficient indirect user revocation mechanism to support access credential revocation. Third, it supports public encapsulation validity test, which enables auditors to filter invalid data, so as to prevent attackers from sending invalid data to stuff users’ accounts. Finally, we prove its security against chosen-ciphertext attacks (CCA) in the standard model. We conduct theoretical analyses and extensive experiments to show that our scheme is practical and efficient in application.

我们提出了一种基于属性的快速数据云外包（FDCO）方案，该方案在移动设备中显示出出色的性能。从技术上讲，这项工作是一种基于CCA安全的在线/离线密钥封装方案，该方案基于基于密文策略的基于属性的加密，并具有公共有效性测试和间接用户撤销机制。我们将其适应于移动云外包方案，并提出了一个具体的系统。我们的方案具有以下理想属性：首先，封装仅需要几个轻量级的在线模块化加/乘操作，这对移动用户很有吸引力。其次，它配备了有效的间接用户吊销机制来支持访问凭证吊销。第三，它支持公共封装有效性测试，使审计人员可以过滤无效数据，从而防止攻击者将无效数据发送到填充用户的帐户。最后，我们在标准模型中证明了其针对选择密文攻击（CCA）的安全性。我们进行了理论分析和广泛的实验，以表明我们的方案是实用和有效的应用程序。