Title: Outsourcing decryption of KP-ABE using elliptic curve cryptography

Authors: Dilip Kumar; Manoj Kumar

Addresses: Department of Computer Science, Babasaheb Bhimrao Ambedkar University, Lucknow, Uttar Pradesh, 226025, India ' Department of Computer Science, Babasaheb Bhimrao Ambedkar University, Lucknow, Uttar Pradesh, 226025, India

Abstract: Internet of things (IoT) has changed our lives greatly and impacted almost everything in the digital world. Devices used in IoT are connected with each other through the internet for communication. These devices are vulnerable to various interceptions and suffer from resource limitations. Key policy attribute-based encryption (KP-ABE) is a modern cryptographic scheme that provides security and access control mechanism in an IoT environment. Therefore, an outsourcing scheme is proposed to outsource decryption of KP-ABE to reduce decryption overhead for resource-constrained devices (RCDs). In our scheme, computational complexity is reduced by using elliptic curve cryptography (ECC) and a linear secret sharing (LSS) scheme is utilised to represent the access policy. The security of our scheme is given under the replayable chosen-ciphertext attacks (RCCAs) model. The implementation shows that our proposed scheme reduces the complexity of decryption and computational time as compared to other schemes.

Keywords: internet of things; IoT; key policy attribute-based encryption; KP-ABE; elliptic curve cryptography; ECC; point scalar multiplication; PSM; access structure; LSS scheme.

DOI: 10.1504/IJICS.2023.134961

International Journal of Information and Computer Security, 2023 Vol.22 No.2, pp.210 - 229

Received: 19 Nov 2021
Accepted: 14 Feb 2022
Published online: 22 Nov 2023 *

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