A decentralized crypto network with dynamic threshold change

Abstract The threshold proxy re‐encryption (tPRE) algorithm not only ensures the separation of data ownership and use right, but also prevents a single from doing evil. In order to avoid collusion multiple proxies, this paper constructs decentralized crypto network (DCN) based on blockchain technology tPRE. DCN is more than key management system, while expanding storage capacity network. Combined with existing distributed schemes, it can store massive data. Due Byzantine failure in networks, nodes join or leave at will. ensure that number meets requirements threshold, authorization operation be carried out smoothly, presents dynamic refresh method tPRE fragments. When there are fragments meet network, allocation encrypted adjusted non‐interactivity self‐adaptively. Non‐interactivity means each node independently refreshes its old into new without collecting other DCN, then distributes DCN. Self‐adaptability refers monitoring changes sets automatically refreshing Finally, performance critical algorithms calculated proposal.