The so-called cloud-enabled Internet of Things (CIoT) systems interconnect numerous devices to render robust data storage, efficient analysis, and message exchange features. However, it confronts the confidentiality of data from the owner as the access control of data is performed by honest-but-curious service providers. Although the encryption strategy ensures data security, it has adverse data deliverance due to its inherent all-or-nothing decryption. Thus, a robust protocol is proposed to achieve data sharing among geographically dispersed physical devices and efficient access to cloud data for clients. The proposed protocol resists the chosen-ciphertext attack (CCA) based on the hardness of the Decisional Diffie–Hellman Inversion (DDHI) assumption. The comprehensive analysis and simulation results show that our protocol is efficient in computation, communication, and storage costs.

所谓的支持云的物联网 (CIoT) 系统将众多设备互连，以提供强大的数据存储、高效分析和消息交换功能。然而，由于数据的访问控制是由诚实但好奇的服务提供商执行的，因此它面临着来自所有者的数据的机密性。虽然加密策略确保了数据安全，但由于其固有的全有或全无解密，它对数据传递不利。因此，提出了一种强大的协议来实现地理上分散的物理设备之间的数据共享以及客户端对云数据的高效访问。所提出的协议基于决策 Diffie-Hellman 反演 (DDHI) 假设的硬度来抵抗选择密文攻击 (CCA)。