IEEE/CIC International Conference on Communications in China (ICCC)

Cooperative Two-Key Generation in Source-Type Model With Partial-Trusted Helpers

Shixun Gong, Na Li, Huici Wu, Xiaofeng Tao

Published Aug 1, 2019• 1 citation

Abstract

This paper investigates the problem of generating two secret keys (SKs) simultaneously over a five-terminal system with terminals labelled as 1, 2, 3, 4 and 5. Each of terminal 2 and terminal 3 wishes to generate an SK with terminal 1 over a public channel wiretapped by a passive eavesdropper. Terminal 4 and terminal 5 respectively act as a trusted helper and an untrusted helper to assist the SK generation. All the terminals observe correlated source sequences from discrete memoryless sources (DMS) and can exchange information over a public channel with no rate constraint that the eavesdropper has access to. Based on the considered model, key capacity region is fully characterized and a source coding scheme that can achieve the capacity region is provided. Furthermore, expression for key leakage rate is obtained to analyze the security performance of the two generated keys.

DOI: 10.1109/iccchina.2019.8855964

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