Attack-Aware Secure Sensor Transmission Using Pinching- Antenna Systems and Trust-Guided Cooperative Jamming

Intelligent sensor networks are increasingly deployed in security-critical environments, where confidential sensing data may be forwarded through low-security relay sensors that are vulnerable to compromise, misuse, or internal eavesdropping. This paper investigates attack-aware secure sensor transmission in a sensor network enabled by a pinching-antenna system (PASS) with a potentially compromised relay sensor. The relay sensor assists data forwarding from a source sensor to a destination fusion center, but its received signal may also cause internal information leakage. To mitigate this threat, a trust-aware cooperative jamming framework is proposed, in which a cooperative security node generates artificial noise, feeds it into the PASS waveguide, and radiates it through selected pinching antennas toward the untrusted relay while limiting interference leakage to the legitimate fusion center. A trust-aware cooperation coefficient is introduced to characterize the security-response capability of the cooperative security node, and a candidate-set-aided PASS activation and jamming-power allocation algorithm is developed for secure sensing-data delivery. Reliable-and-secure probability, secrecy outage probability, and attack-aware secure delivery probability are adopted to jointly evaluate data reliability, confidentiality, and relay-attack resilience. Numerical results show that the proposed scheme improves secure transmission performance compared with fixed-antenna jamming, random PASS activation, trust-unaware PASS, and no-jamming benchmarks. The results also indicate that a detection-triggered PASS response can maintain a higher secure delivery probability as the relay attack probability increases.