Abstract
In the Internet of Things (IoT) environment, the intelligent devices collect and share large-scale sensitive personal data for a wide range of application. However, the power of storage and computing of IoT devices is limited, so the mass perceived data will be encrypted and transmitted to a cloud platform-interconnected IoT devices. Therefore, the concern how to save the encryption/decryption cost and preserve the privacy of the sensitive data in IoT environment is an issue that deserves research. To mitigate these issues, an offline/online attribute-based encryption scheme that supports partial policy hidden and outsourcing decryption will be proposed. This scheme adopts offline/online attribute-based encryption algorithms; then, the key generation algorithm and encryption algorithm are divided into two stages: offline stage and online stage. Meanwhile, in order to solve the problem of policy disclosure under the cloud platform, the policy hidden is supported, that is, the attribute is divided into the attribute value and the attribute name. For the pairing operation involved in decryption process, a verifiable outsourced decryption is implemented. Our scheme is constructed based on composite bilinear groups, which meets full security under the standard model. Finally, by comparing with other schemes in terms of functionality and computational overhead, it is shown that the proposed scheme is more efficient and applicable to the mobile devices with limited computing and storage functions in the Internet of Things environment.
Highlights
With the continuous development of the Internet of Things technology, it has been widely used in the fields of health care, smart home, industrial manufacturing, and environmental monitoring
Due to the cloud server being not completely trusted, how to protect the private information contained in the data and how to deal with the huge computing cost for the mobile devices with limited resources are the problems that should be solved in the current research
Sahai and Waters proposed a new public key cryptosystem called attribute-based encryption (ABE) [1]. It can be divided into two categories according to the location of the access policy: key policy attribute-based encryption (KP-ABE) [2] and ciphertext policy attribute-based encryption (CP-ABE) [3]
Summary
With the continuous development of the Internet of Things technology, it has been widely used in the fields of health care, smart home, industrial manufacturing, and environmental monitoring. Nishide et al [4] first proposed the ciphertext policy attribute-based encryption with hiding access structure. Li et al [6] proposed an efficient attribute-based encryption scheme with partial hiding policy. The scheme has less decryption cost, but the public parameters, ciphertext, and attribute information related to the policy are obtained by arbitrary malicious users. The above scheme only realizes access structure hidden, and the computing overhead relates to the complexity of access structure and the number of attributes; what is more, the process of encryption and decryption needs a large number of modular power operation and pairing operation. We propose an offline/online attribute-based encryption scheme which can hide access structure and support outsourcing decryption. It is shown that our scheme is feasible in IoT by carrying out simulation experiments based on the PBC function library
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