Improved Lightweight Proxy Re-encryption for Flexible and Scalable Mobile Revocation Management in Cloud Computing

In this paper, we propose a Very Lightweight Proxy Re-Encryption (VL-PRE) scheme to efficiently support attribute-based revocation and policy update in the collaborative data sharing in cloud systems. To this end, we propose three-phase VL-PRE protocol including re-encryption key generation, re-encryption key update, and re-encryption key renewal for supporting the optimized attribute revocation and policy update. Finally, we conduct the experiments to evaluate the performance of our VL-PRE and show that it supports the attribute revocation management through resource-constrained mobile devices with a practical and scalable manner.