Can be sized as standard access card (likely thicker with secure log handling) Not readable with magnetics Fixed and randomized access/security key(s) from production or programmable Durable long-term storage for keys and codes Internal log storing for example reading device id's and time stamps Protected and tamper safe (e.g. writing of internal log handled by the device itself) Internal logs can be compared with system logs upon reading (to detect unauthorized use/copying) System can detect and warn for device having been accessed by unknown readers/copiers System can detect and warn for readings at non normal hours (e.g. outside of working hours) System can detect and warn for excessive readings in a day (e.g. one more than expected) System can detect and warn for erased/tampered with internal log Can be produced with chip or connectors protected by slider (opened by reader) my own thoughts on applications: building/room security system keys/codes/certificates machines/vehicles/installations with high security requirements 2026-07-28 Edit: Added Summary