This paper analyzes the physical layer security performance of massive uplink Internet of Things (IoT) networks operating under the finite blocklength (FBL) regime. IoT devices and base stations (BS) are modeled using a stochastic geometry approach, while an eavesdropper is placed at a random location around the transmitting device. This system model captures security risks common in dense IoT deployments. Analytical expressions for the secure success probability, secrecy outage probability and secrecy throughput are derived to characterize how stochastic interference, fading and eavesdropper spatial uncertainty interact with FBL constraints in short packet uplink transmissions. Numerical results illustrate key system behavior under different network and channel conditions.

翻译：本文分析了在有限块长（FBL）机制下运行的大规模上行物联网（IoT）网络的物理层安全性能。采用随机几何方法对物联网设备和基站（BS）进行建模，同时将窃听者置于发射设备周围的随机位置。该系统模型捕捉了密集物联网部署中常见的安全风险。推导了安全成功概率、安全中断概率和安全吞吐量的解析表达式，以描述随机干扰、衰落和窃听者空间不确定性如何在短包上行传输中与FBL约束相互作用。数值结果展示了不同网络和信道条件下的关键系统行为。