Physical Layer Security of Untrusted Relay Networks with Lossy Decode-and-forward

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K17738
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 60060:Information network-related
• Research Institution: Kanagawa University
• Principal Investigator: Qian Shen 神奈川大学, 情報学部, 助教 (80868331)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 物理層セキュリティ / 非信頼中継 / reliable-and-secure確率 / 情報相関 / 有歪み復号転送 / 情報源・通信路結合符号化

Outline of Final Research Achievements

(1) The trade-off between secrecy and reliability was analyzed in untrusted relay networks based on lossy decode-and-forward protocol. Using formal methods from information theory, upper bound conditions for lossless coding rates were determined by intersecting Slepian-Wolf coding regions with multi-access channel coding regions. This analysis led to the calculation of secrecy outage probabilities. (2) Short packet transmissions' reliability and security performance in unreliable relay networks were analyzed. The study confirmed that the highest reliable-and-secure probability (RSP) is achieved when the contributions of source-to-relay and relay-to-destination links are balanced. (3) The physical layer security performance in untrusted relay networks using Alamouti space-time block codes (STBC) was examined. The transmission signal's resistance to potential attacks was evaluated. The optimal power allocation for achieving peak RSP was revealed under real-world constraints.

Free Research Field

情報ネットワーク

Academic Significance and Societal Importance of the Research Achievements

本研究課題は、情報理論に基づく非信頼中継ネットワークの安全性と信頼性に関する新たな解析手法を提供し、特に有歪み復号転送プロトコルの適用による秘匿性-信頼性トレードオフの最適化に貢献した。次世代通信ネットワークにおけるデータ伝送の安全性と信頼性が向上および、IoTや6Gなどの分野において重要な役割を果たす。より安全で信頼性の高い通信ネットワークの構築に寄与し、情報漏洩や通信障害のリスクを軽減することで、安心・安全な社会の実現に貢献する。