Patent ID: 6167137
Filing Date: 2000-12-26
Classification: G07C,G08C,H04L,H04W

Abstract:
In a communications system comprising a plurality of remote transmitting devices and a receiving station having a receiver associated therewith, a method for determining whether a message received from a transmitting device is encrypted or unencrypted, said method comprising the steps of:a) receiving at said receiving station a message from a transmitting device;b) storing said message in a buffer;c) analyzing a portion of said stored message to determine if was validly received;d) further processing said message portion as a validly received unencrypted message when said message portion has been so determined to be validly received;e) analyzing said stored message to determine if it was validly received when said message portion has been so determined to be not validly received;f) further processing said stored message as an encrypted message when said stored message has been so determined to be validly received;g) ignoring said stored message when said stored message has been so determined to be not validly received; wherein said message portion comprises a message portion cyclic redundancy character, and wherein said message portion analyzing step comprises the step of performing a cyclic redundancy check routine on said message portion and comparing the results thereof to said message portion cyclic redundancy character.