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All Journal Vokasi UNESA Bulletin of Engineering, Technology and Applied Science
A Umar
Department of Electrical and Electronics Engineering, Federal University of Transportation, Daura Katsina state, Nigeria
Computer Science & IT Engineering Mechanical Engineering Transportation

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An Efficient IND-CCA2-Secure Certificateless Public Key Encryption Scheme with Cryptographic Reverse Firewalls Lukman Umar Faruk; Muhammad Bashir Abdulrazaq; Zainab Mukhtar Abubakar; Zahruddeen Haruna; A Umar; Nafisa Shehu Usman; Hassan Maharazu
Vokasi UNESA Bulletin of Engineering, Technology and Applied Science Vol. 3 No. 3 (2026): (In Progress)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v3i3.52993

Abstract

Secure communication in Internet of Things (IoT), cloud computing, and peer-to-peer environments requires efficient cryptographic schemes resilient to advanced threats. Public Key Infrastructure (PKI) incurs certificate management overhead, while Identity-Based Encryption (IBE) introduces key escrow. Certificateless Public Key Encryption (CL-PKE) addresses these limitations, but existing constructions integrating Cryptographic Reverse Firewalls (CRFs) remain computationally expensive and lack IND-CCA2 security guarantees. This study develops an optimized CL-PKE-CRF scheme using a single-element public key, sender-side precomputation of pairing operations, and independent per-user randomization through a Key Derivation Function (KDF) at the Key Generation Center (KGC). The scheme was implemented using Charm-Crypto and evaluated over 1,000 iterations at 128-, 192-, and 256-bit security levels. Compared with the baseline, it reduced computational overhead by approximately 25% and communication costs by 33%, while subsequent encryption latency decreased by 76.6% for repeated operations. Simulated evaluations reported adversarial advantage below 0.004, 100% decryption correctness, and no observed information leakage across the tested compromise scenarios. A formal IND-CCA2 security reduction under the Computational Bilinear Diffie-Hellman (CBDH) assumption in the random oracle model is also presented. These findings demonstrate improved efficiency and resistance to exfiltration attacks, supporting secure communication in resource-constrained environments.
Co-Authors Hassan Maharazu Lukman Umar Faruk Muhammad Bashir Abdulrazaq Nafisa Shehu Usman Zahruddeen Haruna Zainab Mukhtar Abubakar