Patent ID: 7904723
Filing Date: 2011-03-08
Classification: G10L,H04L,H04W

Abstract:
1. A method for enhancing security of a communication transmitted by a communicating device, the method comprising: providing a cross-layer watermarking unit in the communicating device, that communicates a token or a key as a watermark message, the cross-layer watermarking unit comprising at least one of an RF watermarking layer, a physical watermarking layer, and a higher watermarking layer; generating a token or a key for encoding watermarking user data; examining the user data in preparation for embedding; embedding each token or key on a bit level into the user data by the cross layer watermarking unit using dirty paper coding (DPC) as a function of the user data stream; sending a node security policy to the cross-layer watermarking unit, wherein the security policy includes selection of a radio interface (RI) independent token or key, a RI specific token or key, or both; transmitting the user data at one or more communication layers for transport watermarking at a transport level in accordance with the node security policy; and authenticating the user data with the token or key embedded into the user data transmission.