Physical surveillance is covert monitoring using hidden devices placed in offices, meeting rooms, vehicles, or equipment. Common examples include concealed microphones, cameras, and tampered peripherals. Unlike network-based attacks, physical surveillance can capture conversations and activity without triggering endpoint alerts, logs, or email defenses.
It matters because confidentiality can be broken even when digital systems are secure. Attackers may use a hidden recorder to overhear strategy discussions, credentials, legal advice, or personnel matters, then remove the device or extract the data later. Defenders reduce this risk with badge and visitor controls, locked storage, regular room sweeps, tamper checks on shared devices, and clear reporting procedures for suspicious electronics. In sensitive environments, room security is part of cybersecurity.