An automated trust negotiation model based on improved coloured timed Petri net

In cross-domain computation, the establishment of mutual trust relationship between entities is the premise and basis of secure interaction. Automated trust negotiation (ATN) is an approach that establishes mutual trust between strangers wishing to share resources or conduct business by gradually requesting and disclosing credentials. According to the weaknesses of conventional ATN models, which are based on the resource unlocking strategy of ordinary tree, this paper puts forward an improved coloured timed Petri net-based ATN model and the concept of optimum certificate set, which could serve simultaneous requests of multiple target resources. Along with synchronised negotiation for finding the optimum certificate set, the negotiation effeciency is substantially improved. Moreover, this model added periodic time constraint mechanism of resource, and increased security ensurance factors for the resource sharing in cross-domain calculation.