An electronic lock utilizes two microprocessors remote from each other for enhanced security. The first microprocessor is disposed close to an input device such as a keypad, and the second microprocessor is disposed close to the lock mechanism and well protected from external access. The first microprocessor...http://www.google.fr/patents/US6977576?utm_source=gb-gplus-shareBrevet US6977576 - Electronic access control device
