A lock is described which has the capability to generate or encrypt a close number which is then displayed to the operator of the lock to be used to verify the locking of the lock. This number must be reported to a central dispatch operation where it is compared with a number similarly generated using identical starting values and an identical encryption algorithm. Comparison of the two numbers, resulting in a compare equal will indicate that the lock has been locked since the lock encryption operation is dependent upon the repowering of the lock. The lock is repowered after it has been opened by rotation of the dial which will extend the bolt and through the rotation of the dial drive a stepper motor/generator to provide electrical power to the lock.