An implementation of ELiPS-based Ciphertext-Policy Attribute-Based Encryption

Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is an advanced encryption method used across various fields, including cloud storage, Personal Health Records, Internet of Things, Internet of Vehicles, and blockchain. However, challenges such as insufficient security levels and performance issues in modern applications pose significant drawbacks inherent to the CP-ABE scheme. Previously, we studied Efficient Library for Pairing Systems (ELiPS)-Based CP-ABE to enhance performance and strengthen security level. This approach involved adopting ELiPS as an efficient library for pairing systems. This study increased the security level up to 128 bits and reduced the computation cost, excluding the decryption process. The decryption part primarily utilizes inversion in the Lagrange coefficient part and pairing, which includes the Miller loop and final exponentiation. Both the final exponentiation and inversion are equivalent to the number of attributes. In this paper, we further explore reducing the decryption process time by minimizing the number of final exponentiations and inversions. The effectiveness of the proposal is confirmed through security and experimental analyses where the decryption time in the proposed scheme decreased by an average of 45.45% compared to previous work.

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ELiPS-based Ciphertext-Policy Attribute-Based Encryption

Anh,

Kawada,

Huda

et al. 2024

IJNC

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Ciphertext-Policy Attribute-Based Encryption (CP-ABE) as an advanced cryptographic method keeps data safe in places like cloud storage and the Internet of Things using pairing-based cryptography. However, it relies on an outdated pairing-based cryptography (PBC) library, making it vulnerable to various attacks. Moreover, it does not meet today's demand for top-level security. Besides, the Efficient Library for Pairing Systems (ELiPS) offers efficient operations related to pairing-based cryptography, delivering high performance while upholding a substantial security standard. To deal with the shortcomings of CP-ABE, we adopt and implement the ELiPS as an efficient library for pairing systems into the CP-ABE framework, namely ELiPSbased CP-ABE. However, CP-ABE requires symmetric pairing, while ELiPS offers asymmetric pairing. To bridge this gap, our approach involves generating a generator g to transform asymmetric to symmetric pairing using Shirase's method, enabling compatibility between ELiPS and CP-ABE. Subsequently, we make several modifications to the CP-ABE framework and choose the appropriate ELiPS functions for integration. Finally, we validate our proposal through experiments involving data access authorization scenarios. Comparing with PBC-based CP-ABE, our ELiPS-based solution demonstrates reduced computational costs across most functions, except decryption. Additionally, our ELiPS-based CP-ABE performs comparably to the competitive MCL library, showcasing its efficiency and effectiveness in modern cryptographic applications.

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An implementation of ELiPS-based Ciphertext-Policy Attribute-Based Encryption

Cited by 3 publications

References 15 publications

Performance Analysis of ELiPS-Based CP-ABE with Optimized Decryption Functions

Performance Analysis of ELiPS-Based CP-ABE with Optimized Decryption Functions

A Minimization Number of Final Exponentiations and Inversions for Reducing the Decryption Process Time in ELiPS-Based CP-ABE

ELiPS-based Ciphertext-Policy Attribute-Based Encryption

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