Wireless update secrecy improved by balancing information age and power
Version Age-of-Information-based Semantic Secrecy Region Analysis
Information Theory
Summary
Keeping wireless data updates fresh and private is tricky because sending updates too often can help eavesdroppers. The paper looks at this tradeoff by measuring how current (or 'young') information is at the receiver and how different the eavesdropper's knowledge is. The authors analyze this with math to find the best ways to send updates and control power so that privacy is maximized. Their results show that carefully adjusting transmission power really helps keep information more secure.
What this means in practice
- •For wireless network engineers: Design update transmission and power control to enhance data freshness and confidentiality against eavesdroppers in wireless systems.
- •For security system developers: Implement power-adaptive communication schemes that maximize privacy in wireless sensor or IoT devices exchanging status updates.
Authors
Qian Wang, Bohai Li, Chao Sun, Lou Zhao, Chunshan Liu, Nikolaos Pappas
Abstract
This paper investigates semantic secrecy in wireless status-update systems using Version Age of Information (VAoI). We model the fundamental tradeoff between informative updates and confidentiality (semantic asymmetry between the legitimate destination and the eavesdropper) using a three-node wiretap channel. To evaluate secrecy performance, we introduce the concept of a semantic secrecy region (SSR) and analyze it from a geometrical perspective. By developing a two-dimensional Markov chain, we derive closed-form expressions for the destination's average VAoI and the probability of semantic asymmetry at the eavesdropper. These results enable the joint optimization of transmission probability and power control. For Rayleigh fading channels, we characterize the optimal SSR boundary and power allocation. Numerical results validate our analysis, showing that optimized power allocation significantly enlarges the secrecy region compared with fixed-power benchmarks.