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

CP-ABE emerges as an advanced cryptographic method that offers secure and precise access control in Internet of Things and cloud storage applications. Nevertheless, the original CP-ABE algorithm relied on the PBC library with a security level limited to 80 bits and is now outdated, making it vulnerable to attacks. To address this issue, we have introduced ELiPS-based CP-ABE, which boosts the level of security to 128 bits using the ELiPS library. While this enhancement improved the overall performance, the decryption functions remained computationally intensive. To tackle this, we previously optimized the decryption function by minimizing final exponentiations and inversions. In this paper, we evaluate and analyze the impact of these optimizations on decryption efficiency. Moreover, we compare the ELiPS-based CP-ABE with these improvements to the initial version and the original PBC-based CP-ABE. As a result, the combination of both optimization techniques resulted in an average \(43.06\%\) overall reduction in decryption time compared to the initial version of the ELiPS-based CP-ABE scheme, while in total execution, it led to a \(25.27\%\) improvement. Furthermore, there was an average \(53.81\%\) overall reduction in total execution time compared to the original PBC-based CP-ABE method.