Safety guard to the respect of a message not allow for an object or the use of a authorized of an object and method of implementation of the safety guard

摘要

The security mechanism prevents non authorised access to an object (1) or non authorised use of an object. There are several generators of coded signals (4,5,6). The coded signal generator receives an interrogation signal sent by the transmitter and receiver unit. The signal response is received and a transformation unit transforms the signal to the image time domain producing a response to a single way input signal.