Secure group communication based on distributed parallel ID-based proxy re-encryption

A distributed parallel proxy re-encryption scheme is proposed, so as to get with to distributed environment, such as cloud computing. The network model is has two-layer hierarchical structures: the first layer network is formed by the sender and a set of proxy nodes; the second layer network is masked up by clients such as pocketbook, tablet computer and even phones. Each group is a basic distributed parallel cell, which often has a sever node and several computer nodes. The distributed parallel ID-based proxy re-encryption algorithm obtains the higher utilization rate of several computer nodes. The messages are optimized parallel with randomness reusing and cipher text aggregation, which will reduce the computation and transmission overheads further. Experiment result shows that the scheme is very efficient.