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公开(公告)号：EP4195581A1
公开(公告)日：2023-06-14
申请号：EP21213270.8
申请日：2021-12-08
申请人： Nagravision Sàrl
摘要： A pairing method between a user device (1) and an operator device (2), the user device (1) being intended to receive conditional access data from the operator device (2), the user device having a user device identifier ( U ID ), the operator having an operator device identifier ( O ID ). The method comprises receiving, by the user device, a user device key ( KU ID ) derived from a first cryptographically secure function and receiving, by the operator device, an operator key ( KO ID ) derived from a second cryptographically secure function. The user device comprises a user device bilinear mathematical function ( e ( KU ID , O ID )) and the operator device comprises an operator bilinear mathematical function ( e ( U ID , KO ID )) which each define a pairing over an elliptic curve. The method includes generating, by the operator device (2), a pairing key ( KD = e ( U ID , KO ID )) between the user device (1) and the operator device (2), using the operator key ( KO ID ) and the device identifier ( U ID ) as variables of the operator mathematical function ( e ( U ID , KO ID )) . The user device (1) generates the same pairing key (KD = e ( KU ID , O ID )) using the user device key ( KU ID ) and the operator device identifier ( O ID ) as variables of the user device mathematical function e ( KU ID , O ID ).
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