Patent ID: 8055903

Claim:
A method of communicating a digital message with an information signal, the method comprising: encoding the information signal using a model-based coder, the encoding resulting in an encoded signal having a frame that is M bits in length; encrypting the encoded signal based on a bitwise exclusive-or operation of the encoded signal with a key stream, the encrypting resulting in an encrypted signal that is also M bits in length; substituting a predetermined combination of N bits of the encrypted signal with at least a portion of the digital message, the substitution of the N bits resulting in a composite signal, wherein the predetermined combination of N bits is determined at least in part based on a position, as encoded by the model-based coder, of each of the N bits within the M-bit frame of the encoded signal; and transmitting the composite signal to a receiving node; wherein M and N are positive integers and N is less than M.