VIDEO H . 264 ENCRYPTION PRESERVING SYNCHRONIZATION AND COMPATIBILITY OF SYNTAX

摘要

A method for encrypting data exchanged between an encoder and a decoder in a video system, comprising the following steps: 1) a set of bits which, when encoded, do not have any influence upon the decoding stage, is determined during the encoding stage; 2) at least one part or all of the bits selected in stage 1 is/are encoded prior to transmission to the decoding stage. The bit selection stage consists in determining the parts of the flow of bits that only modify the contexts of the decoding process in an insignificant manner in the sense that the modification due to encryption does cause desynchronization or does not lead to non-compatible bit flows with regard to encoding contexts and visual impact. Use: with H.264 encoders/decoders.