Abstract
Abstract In large scale Internet of Things (IoT) systems, IoT-Cloud is a scalable and practical method to achieve high-efficiency data management accommodation through delegating the data storage and management tasks to the cloud service providers (CSPs). To cope with the low-computability and limited-resource of IoT devices and the response-latency of CSPs, recent works introduce an IoT-Fog-Cloud architecture. Yet, the existing attribute-based data sharing solutions with high computation requirements are no longer suitable for this new architecture. In this paper, we propose a ciphertext-policy attribute-based encryption scheme for the architecture to address the above challenges. The expensive offline encryption is delegated to the fog by constructing an intermediate ciphertext pool with the help of a Chameleon hash function. A public verification is performed to filter the illegitimate ciphertexts before executing the decryption operation. We provide a formal proof of the security and extensive performance analyses. These demonstrate that the scheme is suitable for resource-constrained IoT devices.
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