Parallel Proxy-Signcryption Scheme in Cloud Environment

A parallel proxy signcryption scheme is proposed, which significantly improves the secure message transmission in cloud environment. The imbalanced network model is presented, that is, powerful proxy agents are assumed the cloud service center, end users with limited ability are the sender and receiver of message transmission. The parallel proxy signcryption algorithm places the most calculating on the proxy agents, reducing the burden of end users. The messages are processed in parallel to reduce the computation and transmission overheads. Experiment result shows that, the improvement of CPU time is close to the theoretical value 50%.