AS-T[formula omitted]BP: An efficient assignment scheme for space TT&C tasks with bidirectional privacy-preserving under blockchain architecture

Abstract

In recent years, the space Tracking Telemetry and Command (TT&C) network has attracted much attention because it can provide users with secure and convenient information services. However, there are still challenges in achieving efficient task assignments and providing privacy-preserving for both TT&C parties in precise space TT&C services. In this paper, we propose an efficient blockchain-based task assignment scheme (AS-T3BP) in space TT&C network. Specifically, we introduce authorized privacy set intersection to ensure bidirectional privacy security for task requesters and performers and integrate an improved cuckoo filter algorithm to achieve batch assignment for tasks. And AS-T3BP allows the executor to customize the access policies of TT&C information flexibly, and only authorized satellites can access the information and verify the assignment results. For tasks that fail to be assigned, we propose a distributed and credible task reassignment method, which publishes the tasks on the blockchain built by the TT&C base station, thereby ensuring the real-time and accuracy of task assignments. Performance analysis shows that AS-T3BP is effective and can minimize misinform rates and reassignment rates of 23.39% and 8.85%, alleviate the problem of inefficient task assignment, and still maintain system stability.