Lattice-Guided Secure Edge Collaboration: An Efficient IBE-to-ABE ReEncryption Framework over Recycled Smartphone Edge Clusters in Temporal Cloud Environments

Abstract

Cloud-assisted and edge-enabled environments have become fundamental infrastructures for large-scale data storage, collaborative processing, and real-time analytics. While Ciphertext-Policy Attribute-Based Encryption (CP-ABE) provides fine-grained access control, its computational overhead renders it impractical for resource-constrained devices. Identity-Based Encryption (IBE), on the other hand, offers lightweight encryption but lacks flexible access policies. Meanwhile, the rapid obsolescence of smartphones has created a vast pool of discarded yet computationally capable devices, which can be repurposed as collaborative edge nodes. In this paper, we propose LEGSEC (Lattice-Guided Edge Secure Collaboration), a unified framework that integrates (i) IBE-to-CP-ABE proxy re-encryption for secure data sharing, (ii) lattice-theoretic resource orchestration for SLAaware task allocation, and (iii) distributed computation across recycled smartphones functioning as temporal edge clusters. Our scheme introduces a verifiable, non-interactive, and cost-aware re-encryption mechanism combined with an adaptive scheduling algorithm modeled over temporal graphs. We provide formal security analysis, algorithmic descriptions, and experimental evaluations demonstrating improved computational efficiency, reduced SLA violations, and enhanced throughput compared to baseline approaches. The proposed framework establishes a secure, sustainable, and computationally efficient paradigm for cloud assisted environments leveraging latent mobile edge resources.