SECURITY DEVICE ACCESS

摘要

Technology is described to control a security device providing access to a restricted resource. The method can include generating a plurality of security access codes at a security locking device using at least one pre-configured symmetric key. The access codes may each be valid from predefined start times for varying time intervals. In a further operation, a candidate access code can be generated at a control server, using the same pre-configured symmetric key. The candidate access code from the control server can be provided to the security locking device. The security locking device can unlock when the candidate access code corresponds to at least one of a valid security access codes on the security locking device.