Invention Grant
US08666072B2 Method and a system for receiving a multimedia signal, a cryptograophic entity for said reception method and system, and a method and a black box for producing said cryptographic entity
有权
用于接收多媒体信号的方法和系统，用于所述接收方法和系统的密码实体，以及用于产生所述密码实体的方法和黑匣子
- Patent Title: Method and a system for receiving a multimedia signal, a cryptograophic entity for said reception method and system, and a method and a black box for producing said cryptographic entity
- Patent Title (中): 用于接收多媒体信号的方法和系统，用于所述接收方法和系统的密码实体，以及用于产生所述密码实体的方法和黑匣子
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Application No.: US11815938Application Date: 2006-02-14
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Publication No.: US08666072B2Publication Date: 2014-03-04
- Inventor: Bruno Tronel , Franck Baudot
- Applicant: Bruno Tronel , Franck Baudot
- Applicant Address: FR Paris la Defense Cdx
- Assignee: Viaccess
- Current Assignee: Viaccess
- Current Assignee Address: FR Paris la Defense Cdx
- Agency: Stites & Harbison, PLLC.
- Agent B. Aaron Schulman, Esq.
- Priority: FR0501466 20050214
- International Application: PCT/FR2006/000335 WO 20060214
- International Announcement: WO2006/085017 WO 20060817
- Main IPC: H04N7/167
- IPC: H04N7/167 ; H04L29/06 ; H04L9/32
Abstract:
This method of receiving a multimedia signal scrambled by means of a control word uses a first cryptographic entity that can be connected to any one of P second cryptographic entities to form part of a device for receiving the scrambled multimedia signal. Only second cryptographic entities of a group of N second cryptographic entities selected from a wider set of P second cryptographic entities use a session key obtained by diversifying a root key identical to the root key used to obtain the session key of the first cryptographic entity.
Public/Granted literature
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