METHOD AND SYSTEM FOR SECURE BROADCASTING OF A DIGITAL DATA STREAM

摘要

Method and system for secure broadcasting of a digital data stream between a technical platform (1) and at least one terminal (2), characterized in that it comprises the following steps: transmission of a scrambled and multiplex stream of digital data to at least one message (ECM) comprising a control key (CW) encrypted by a string key (CC); descrambling in a secure memory area of the terminal (2) of the scrambled stream of digital data on the basis of the control key (CW) obtained according to the following substeps: dispatching to the technical platform (1) of a request comprising the identifier (SUi) of the terminal (2); generation of a secret key (CSk) on the basis of a cryptographic mechanism (A) using a unique cipher key (BSKn) and the identifier (IUj) of the terminal (2) with a view to enciphering said string key (CC) and to obtaining a message (eCCk); deciphering of the message (eCCk) received by the terminal (2) on the basis of the key (CSk) initially stored in the terminal (2) so as to obtain the string key (CC), and obtaining the control key (CW) resulting from the deciphering of the message (ECM) on the basis of the string key (CC).