Vehicular fog computing (VFC), combining the vehicular ad hoc network with fog computing, is an efficient vehicle communication architecture. However, the user data is often threatened since VFC is an open environment. Attribute-based encryption (ABE) is suitable for open scenarios, such as cloud and Internet of Things, because of its confidentiality and access control characteristics. However, the traditional ABE has disadvantages, such as the inability to hide the attributes in the access policy and the use of computationally inefficient composite order bilinear pairing groups to prove adaptive security. Traditional ABE is not practical in VFC. We summarized the existing schemes of full policy hiding ABE and partial policy hiding ABE and then concluded that partial policy hiding ABE is more suitable for VFC. We combine policy hiding technology and the technology of converting bilinear pairing cryptography schemes into prime-order bilinear pairing cryptography schemes and propose an efficient and partial policy hiding ciphertext-policy ABE scheme suitable for VFC. Experiments have proved that our scheme is computationally more efficient than previous policy hiding ABE schemes.

车辆雾计算（VFC）将车辆自组织网络与雾计算相结合，是一种高效的车辆通信架构。然而，由于 VFC 是一个开放的环境，用户数据经常受到威胁。基于属性的加密（ABE）由于其机密性和访问控制特性，适用于开放场景，例如云和物联网。然而，传统的 ABE 有缺点，例如无法隐藏访问策略中的属性以及使用计算效率低下的复合阶双线性对组来证明自适应安全性。传统的 ABE 在 VFC 中并不实用。我们总结了现有的全策略隐藏 ABE 和部分策略隐藏 ABE 的方案，然后得出结论，部分策略隐藏 ABE 更适合 VFC。我们将策略隐藏技术和将双线性对密码方案转换为素阶双线性对密码方案的技术相结合，提出了一种适用于VFC的高效、部分策略隐藏的密文-策略ABE方案。实验证明，我们的方案在计算上比以前的策略隐藏 ABE 方案更有效。