Keyfobs
Keyfob is a small electronic device used to control access to doors or vehicles without inserting a traditional key. Modern keyfobs are compact, battery-powered modules that may combine a remote-control transmitter with a passive or active transponder, enabling entry and sometimes ignition through radio signals.
Keyfobs come in several variants. Passive keyfobs draw energy from the reader to power the transponder, while
Most keyfobs operate using radio frequency communication. In automotive and access-control contexts, nearby devices use short-range
Typical applications include vehicle remote keyless entry and ignition, building and gate access, hotel room access,
Security considerations include the risk of cloning, interception, or relay attacks. Countermeasures include rolling codes, mutual