A battery operated cable security seal for cargo containers and the like includes housing with a transparent cover for visual inspection of illuminated internal green or red LEDs, the red LED representing a tampered state of a stranded metal locking cable, which has a length sufficient to secure the keeper bars and hasp of a cargo container door. The cable has an internal conductor whose conductivity, e.g., resistance, manifests a tampered condition when severed and also if reattached, e.g., by a solder or spliced joint and so on. The electrical continuity of the conductor is monitored by a circuit in one embodiment for a severed state, i.e., tampering, and whose resistance is monitored in a second embodiment correlated optionally to either or both ambient temperature and a battery output voltage. The seal housing has two compartments one being hermetically sealed and contains the circuitry and the other containing a cable locking device for receiving and locking the cable to the seal. The circuit includes an RFID tag which may be part of a mesh network configuration with other tags.

This application claims the benefit of provisional application Ser. No. 60/557,482 filed Mar. 30, 2004, entitled “RFID SEAL AND METHOD FOR INITIALIZATION” and Ser. No. 60/636,818 filed Dec. 16, 2004 entitled “ELECTRONIC SECURITY SEAL”, incorporated by reference herein in their entireties

This invention relates to security seals of the type including a stranded metal cable and a locking body for securing a door, including keeper bars and hasps used with cargo containers, trucks, warehouses, and the like, the seal including electronics for monitoring the locked and tampered states of the cable, the monitoring electronics preferably including an RFID tag transmission/interrogation device.

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