Abstract: An electric strike for a door frame, comprising: a body; a keeper moveably attached to the body for selectively retaining a latch bolt on a door; a blocking element movable between a blocking position in which the blocking element locks the keeper to prevent a latch from being moved past the keeper, and an unblocking position in which the blocking element unlocks the keeper to allow the latch to move past the keeper; an electronically controlled electric actuator for moving the blocking element between the blocking position and the unblocking position; and an override mechanism to override the electric actuator.

Abstract: A method for an authorised device to effect unlocking of a lock, the authorised device initially being an unverified device, the method comprising: a lock controller operatively interfaced to the lock communicating to a verified device a lock ID of the lock controller via a local communication channel; the verified device generating encrypted data comprising the lock ID; the verified device communicating the encrypted data to the authorised device via a data communication channel; the authorised device obtaining a decryption key for decrypting the encrypted data; the authorised device determining the lock ID by decrypting the encrypted data using the decryption key; the authorised device generating with the lock ID a response to a challenge by the lock controller; the lock controller determining that the response is a correct response; and in response, the lock controller causing unlocking of the lock.