METHOD AND DEVICE FOR GUARANTEEING THE INTEGRITY AND AUTHENTICITY OF A SET OF DATA

摘要

The invention concerns a method and a device for guaranteeing the integrity and authenticity of data transmitted between a management centre and one or several receiver units, wherein each receiver unit comprises a decoder (IRD) and a security unit (SC) and means for communicating (NET, REC) with the management centre. The method consists in calculating a control information (Hx) representing the result of a function said to be unidirectional and collision-free, performed on all or part of the transmitted data and in transmitting the result to the management centre for verification. The centr e will be able to inform the decoder concerning the authenticity of the data b y return channels or by the main channel.