WO2001089215A3 - Method for transmitting encrypted data, use of same in a pay digital television system and decoder used in said system - Google Patents

Method for transmitting encrypted data, use of same in a pay digital television system and decoder used in said system Download PDF

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Publication number
WO2001089215A3
WO2001089215A3 PCT/FR2001/001465 FR0101465W WO0189215A3 WO 2001089215 A3 WO2001089215 A3 WO 2001089215A3 FR 0101465 W FR0101465 W FR 0101465W WO 0189215 A3 WO0189215 A3 WO 0189215A3
Authority
WO
WIPO (PCT)
Prior art keywords
module
same
encrypted data
digital television
mod
Prior art date
Application number
PCT/FR2001/001465
Other languages
French (fr)
Other versions
WO2001089215A2 (en
Inventor
Jean-Luc Dauvois
Original Assignee
Canal Plus Technologies
Jean-Luc Dauvois
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
Application filed by Canal Plus Technologies, Jean-Luc Dauvois filed Critical Canal Plus Technologies
Priority to AU62406/01A priority Critical patent/AU6240601A/en
Publication of WO2001089215A2 publication Critical patent/WO2001089215A2/en
Publication of WO2001089215A3 publication Critical patent/WO2001089215A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/30—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
    • H04L9/3006—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy underlying computational problems or public-key parameters
    • H04L9/302—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy underlying computational problems or public-key parameters involving the integer factorization problem, e.g. RSA or quadratic sieve [QS] schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3263—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
    • H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H04L63/0442—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Databases & Information Systems (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Technology Law (AREA)
  • Computing Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The invention concerns a transmission method between a first module (25) and a second module (26) comprising the following steps: in the first module (25): calculating y such that y = g ^ x mod (p), g and x being the random numbers preserved in the terminal, p being a prime number, g and p being known to the two modules; transmitting (38) the value y to the second module; in the second module (26): retrieving (32) the value y; generating (30) a random variable k; calculating (31) two values A and B, such that A = g ^ k mod (p) B = y ^ k.M mod (p), M being a known message to be transmitted in encrypted form; transmitting (34) values A and B to the first module (25); in the first module (25): retrieving (36) the message M using the following formula: M = B/(A ^x)mod (p).
PCT/FR2001/001465 2000-05-16 2001-05-15 Method for transmitting encrypted data, use of same in a pay digital television system and decoder used in said system WO2001089215A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU62406/01A AU6240601A (en) 2000-05-16 2001-05-15 Method for transmitting encrypted data, use of same in a pay digital television system and decoder used in said system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0006205A FR2809269B1 (en) 2000-05-16 2000-05-16 METHOD FOR TRANSMITTING ENCRYPTED DATA, APPLICATION OF SUCH A METHOD IN A DIGITAL TELEVISION SYSTEM AND A DECODER USED IN SUCH A SYSTEM
FR00/06205 2000-05-16

Publications (2)

Publication Number Publication Date
WO2001089215A2 WO2001089215A2 (en) 2001-11-22
WO2001089215A3 true WO2001089215A3 (en) 2003-05-15

Family

ID=8850261

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2001/001465 WO2001089215A2 (en) 2000-05-16 2001-05-15 Method for transmitting encrypted data, use of same in a pay digital television system and decoder used in said system

Country Status (3)

Country Link
AU (1) AU6240601A (en)
FR (1) FR2809269B1 (en)
WO (1) WO2001089215A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997038530A1 (en) * 1996-04-03 1997-10-16 Digco B.V. Method for providing a secure communication between two devices and application of this method
WO1998043426A1 (en) * 1997-03-21 1998-10-01 Canal+ Societe Anonyme Broadcast and reception system, and conditional access system therefor
WO1999018728A1 (en) * 1997-10-02 1999-04-15 General Datacomm, Inc. Interconnecting multimedia data streams having different compressed formats
US5974144A (en) * 1998-02-25 1999-10-26 Cipheractive Ltd. System for encryption of partitioned data blocks utilizing public key methods and random numbers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997038530A1 (en) * 1996-04-03 1997-10-16 Digco B.V. Method for providing a secure communication between two devices and application of this method
WO1998043426A1 (en) * 1997-03-21 1998-10-01 Canal+ Societe Anonyme Broadcast and reception system, and conditional access system therefor
WO1999018728A1 (en) * 1997-10-02 1999-04-15 General Datacomm, Inc. Interconnecting multimedia data streams having different compressed formats
US5974144A (en) * 1998-02-25 1999-10-26 Cipheractive Ltd. System for encryption of partitioned data blocks utilizing public key methods and random numbers

Also Published As

Publication number Publication date
AU6240601A (en) 2001-11-26
FR2809269A1 (en) 2001-11-23
WO2001089215A2 (en) 2001-11-22
FR2809269B1 (en) 2002-10-04

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