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TW200605595A - Method to secure a broadcasted event - Google Patents

Method to secure a broadcasted event

Info

Publication number
TW200605595A
TW200605595A TW094106856A TW94106856A TW200605595A TW 200605595 A TW200605595 A TW 200605595A TW 094106856 A TW094106856 A TW 094106856A TW 94106856 A TW94106856 A TW 94106856A TW 200605595 A TW200605595 A TW 200605595A
Authority
TW
Taiwan
Prior art keywords
event
secure
access conditions
control
control block
Prior art date
Application number
TW094106856A
Other languages
Chinese (zh)
Inventor
Rached Ksontini
Henri Kudelski
Original Assignee
Nagracard Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP04102667A external-priority patent/EP1605698A1/en
Application filed by Nagracard Sa filed Critical Nagracard Sa
Publication of TW200605595A publication Critical patent/TW200605595A/en

Links

Landscapes

  • Storage Device Security (AREA)

Abstract

The aim of this invention is to propose a solution to prevent the modification of access conditions to an encrypted multimedia content. This aim is achieved by a method to secure an event with control words (CW), the use of this event by user units being subjected to access conditions (AC), said method comprising the following steps: - generation of a pseudo-random number (RNG), - formation of a control block (CB) by the association of the pseudo-random number (RNG) and the access conditions (AC), - calculation of the control word (CW) by the application of a unidirectional function (F) on the control block (CB), - use of the control word (CW) to encrypt the event, - transmission of the control block (CB) to the user units.
TW094106856A 2004-03-11 2005-03-07 Method to secure a broadcasted event TW200605595A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4052004 2004-03-11
EP04102667A EP1605698A1 (en) 2004-06-11 2004-06-11 Security method for a broadcast service

Publications (1)

Publication Number Publication Date
TW200605595A true TW200605595A (en) 2006-02-01

Family

ID=57807189

Family Applications (1)

Application Number Title Priority Date Filing Date
TW094106856A TW200605595A (en) 2004-03-11 2005-03-07 Method to secure a broadcasted event

Country Status (1)

Country Link
TW (1) TW200605595A (en)

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