Method for authenticating communication participants, and system for application of the method.

THE KNOWN METHODS TO AUTHENTICATE PARTICIPANTS IN A COMMUNICATION ADD A CODE WORD TO A COMMAND SIGNAL, WHOSE CODE WORD IS A CRYPTOGRAPHIC FUNCTION OF THE COMMAND SIGNAL AND A KEY VALUE THAT IS, IN turn, A FUNCTION OF MASTER KEY VALUE AND A WORD OF EXCHANGE CODE. THE MASTER KEY VALUE HAS A PERMANENTLY FIXED VALUE, UNLIKE THE WORD OF EXCHANGE CODE THAT IS USED TO CHANGE THE KEY VALUE. THE METHOD OF THE INVENTION MAKES USE OF A KEY VALUE THAT IS A FUNCTION OF AT LEAST ONE PREVIOUS KEY VALUE, THE MASTER KEY VALUE WITH THE PERMANENTLY FIXED VALUE, WHICH, ONCE HAS BEEN UNCOVERED OR FILTERED, ELIMINATES ENCRYPTION THAT IS NO LONGER NEEDS TO.