In order to hide an authentication code or signature (101, 402, 504) in an electric signal (100, 400, 401), which consists of data parts with a certain value, certain data parts are selected from the electric signal for processing on the basis of the contents of the authentication code. The value of...http://www.google.fr/patents/US6094722?utm_source=gb-gplus-shareBrevet US6094722 - Hiding a authentication code in an electric signal
Hiding a authentication code in an electric signal
