Patent ID: 6075859
Filing Date: 2000-06-13
Classification: H04L

Abstract:
In a communications system, a method of transforming a set of message signals representing a message comprising the steps offirst encoding one of said set of message signals in accordance with a first keyed transformation;second encoding said one of said set of message signals in accordance with at least one additional keyed transformation;third encoding said one of said set of message signals in accordance with a self inverting transformation in which at least one of said set of message signals is altered;fourth encoding said one of said set of message signals in accordance with at least one additional inverse keyed transformation wherein each of said at least one additional inverse keyed transformation is a corresponding inverse of said at least one additional keyed transformation; andfifth encoding said one of said set of message signals in accordance with first inverse keyed transformation wherein said first inverse keyed transformation is the inverse of said first keyed transformation;wherein said step of first encoding is performed in accordance with a first table and in a first direction, and wherein said step of second encoding is performed in accordance with said first table and wherein each of said additional keyed transformations are performed in alternating directions.