An electronic barrel lock and key system that functions in combination with a computer that codes an electronic master key, or an electronic standard key, or an electronic programming module and includes an electronic lock having a lock security device. The master key has no restrictions, based on how it is programmed, therefore it can open any of the locks. The standard key includes restrictions that precludes the key from opening the lock. The programming module cannot open a lock it is only used to program or reprogram a lock. The lock security device is utilized to prevent a person from opening the lock by applying a high temperature to the lock. The security device utilizes a low-melt alloy that is isolated from the electronic elements located within the lock. When the low-melt alloy melts it causes the lock to be placed in a permanent locked state. The system also has a non-rotating non-keyed interface between the key and the lock.