Signal authenticity is the ability to verify that a network signal really comes from a trusted source. In wireless systems, that means a device can tell whether a nearby tower, access point, or base station is legitimate rather than a lookalike set up to mislead it. This matters because many connection decisions happen before higher-layer security controls are active.
In cyber security, weak signal authenticity can enable rogue base stations, evil-twin Wi-Fi access points, and other interception or tracking attacks. An attacker may try to lure devices into connecting, downgrade protections, or collect identifiers and traffic metadata. Defenses include mutual authentication, signed network identities, roaming policies, and monitoring for unexpected radio behavior. In 5G and other mobile networks, strong signal authenticity helps prevent devices from trusting the wrong edge infrastructure and reduces the chance that an attacker can shape a connection at the radio layer.