Patent ID: 7995751

Claim:
In a communications system, a method of transforming a set of message signals representing a message comprising: first encoding one of said set of message signals in accordance with a first keyed transformation by a hardware processor; second encoding said one of said set of message signals in accordance with at least one additional keyed transformation by the hardware processor; 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 by the hardware processor; 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 by the hardware processor; and fifth encoding said one of said set of message signals in accordance with first inverse keyed transformation by the hardware processor 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.