PT1590960E - MéTODO PARA ARMAZENAR E TRANSMITIR DADOS GERADOS POR UM MËDULO DE SEGURANÃA - Google Patents

MéTODO PARA ARMAZENAR E TRANSMITIR DADOS GERADOS POR UM MËDULO DE SEGURANÃA Download PDF

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Publication number
PT1590960E
PT1590960E PT04708411T PT04708411T PT1590960E PT 1590960 E PT1590960 E PT 1590960E PT 04708411 T PT04708411 T PT 04708411T PT 04708411 T PT04708411 T PT 04708411T PT 1590960 E PT1590960 E PT 1590960E
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PT
Portugal
Prior art keywords
module
security module
information
user unit
data
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Application number
PT04708411T
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English (en)
Inventor
Olivier Brique
Gr Gory Duval
Christian Wirz
Xavier Carrel
Patrick Hauert
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Nagravision Sa
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Application filed by Nagravision Sa filed Critical Nagravision Sa
Publication of PT1590960E publication Critical patent/PT1590960E/pt

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    • 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
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    • Y10S370/00—Multiplex communications
    • Y10S370/901—Wide area network
    • Y10S370/902—Packet switching
    • Y10S370/903—Osi compliant network
    • Y10S370/906—Fiber data distribution interface, FDDI
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S370/00—Multiplex communications
    • Y10S370/901—Wide area network
    • Y10S370/902—Packet switching
    • Y10S370/903—Osi compliant network
    • Y10S370/907—Synchronous optical network, SONET
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99941—Database schema or data structure
    • Y10S707/99943—Generating database or data structure, e.g. via user interface

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Description

DESCRIÇÃO "MÉTODO PARA ARMAZENAR E TRANSMITIR DADOS GERADOS POR UM MÓDULO DE SEGURANÇA".
Essa invenção relaciona-se ao domínio da transmissão de dados numa rede de aparelhos ligada a um centro de radiodifusão e sem qualquer conexão de retorno permanente.
Numa rede de televisão por assinatura, ocorre frequentemente que os aparelhos dos usuários recebem sinais de controle de um centro de gerenciamento, esses sinais permitem a gestão da segurança de acesso aos dados radiodifundidos.
Mecanismos complexos têm sido desenvolvidos de modo que muitas funções individuais possam ser acedidas sem a necessidade de uma conexão a um centro de gestão.
Entre esses mecanismos, pode-se citar o acesso por demanda aos conteúdos graças à presença de um crédito a atribuir livremente ao evento escolhido. "Conteúdos" são entendidos como um serviço de informação relacionado à bolsa de valores, previsão do tempo, televisão de interesse geral, evento desportivo etc. Esses conteúdos podem ser transmitidos nas unidades de certos usuário, tal como um decodificador de televisão por assinatura, um computador ou até mesmo um telefone móvel, 2 um palmtop, uma PAD, um rádio, uma televisão ou um terminal multimédia. 0 fluxo digital é criptografado de forma a tornar possível controlar o uso do mesmo e a definir certas condições para tal uso. Essa criptografia é feita graças a palavras de controlo, que são alteradas em intervalos regulares (entre 5 e 30 segundos) de forma a dissuadir qualquer ataque para encontrar a tal palavra de controlo. A unidade do usuário inclui um módulo de segurança, em geral, removível, que gere as operações de segurança, tal como a verificação dos direitos e chaves de descodificação necessárias (palavras de controlo) para o descodificador aceder aos dados transmitidos. A quantidade de uso de tais conteúdos é, hoje em dia, com base no princípio de assinatura ou compra de evento. A assinatura permite a definição de um direito associado com um ou mais canais de radiodifusão e permite ao usuário aceder a esses canais de forma aberta se o direito existe na sua unidade de segurança.
Ao mesmo tempo, é possível definir direitos pertencentes a um conteúdo particular, tal como um filme ou um jogo de futebol americano. O usuário pode requerer esse direito (compra, por exemplo) e esse conteúdo será 3 especificamente gerido por esse direito. Esse método é conhecido sob o termo compra impulsiva (pay-per-view PPV).
Durante a descodificação de palavras de controlo, será verificado se um direito associado com as condições de acesso está presente no módulo de segurança.
Sempre que a comparação é positiva, a palavra de controlo é retornada, de forma transparente, para a unidade do usuário.
Algumas unidades de usuário têm um canal de retorno para comunicar a escolha do usuário e, portanto, adquirir os direitos pertencentes a uma escolha particular. Esse canal é, em geral, um modem conectado a uma linha telefónica ou a uma rede. Devido à relutância de certas pessoas a qualquer forma de supervisão sobre o consumo actual de conteúdos, o cabo não é simplesmente ligado ao encaixe da linha telefónica e os dados não são transmitidos ao centro de gestão. Pode ser que essa conexão não seja feita por razões práticas, por exemplo, porque o encaixe da linha telefónica está demasiadamente distante da aparelhagem de televisão.
Quando do estabelecimento de um módulo de segurança para um novo cliente, um crédito é usualmente atribuído ao mesmo, permitindo que este teste a praticabilidade de 4 compra impulsiva. Esse crédito não é cobrado ao cliente, porque este pode nunca ser utilizado.
Em condições normais de operação, o usuário compra um ou dois filmes com esse crédito e conecta a sua unidade de usuário para recarregamento. Nesse momento, o centro de gestão estabelece a factura de dois filmes comprados e recarrega o módulo com a quantidade que foi previamente acordada com o usuário. O centro de gestão não pode facturar o consumo feito nesse crédito inicial até que o usuário conecte a sua unidade a uma rede. Dessa forma, a quantidade total de créditos não facturados em todas as unidades de segurança pode ser considerável.
Acções têm sido tomadas tal como a proposta de jogos para encorajar, através da distribuição de um prémio, os usuários a conectar as suas unidades. O problema surge definitivamente quando a mudança do módulo de segurança é feita, em geral, por razões de evolução técnica. O operador está satisfeito quando o usuário faz essa mudança no tempo e não é difícil obrigar o usuário a retornar seu antigo cartão com o objetivo de serviços de faturamento. Dessa forma, o crédito usa dados de extratos de conta contidos no módulo anterior, considerados como perdidos. 5 ΕΡ0809402 descreve um módulo de segurança externo e substituível. O objetivo dessa invenção é ser capaz de recuperar a informação relacionada ao uso do crédito em um módulo de segurança e transmitir essa informação para um centro de gestão.
Esse objetivo é alcançado por um método de armazenamento e transmissão de informação gerado por um primeiro módulo de segurança conectado a uma unidade de usuário, esse primeiro módulo de segurança compreendendo um identificador único e informação representativa da funcionalidade do mesmo, esse primeiro módulo pode ser substituído por um segundo módulo de segurança, esse método compreende as seguintes etapas de: - determinação da informação específica contida no primeiro módulo de segurança pretendido para transmissão; transferência dessa informação na unidade de usuário; -armazenamento dessa informação na unidade de usuário; - substituição do primeiro módulo de segurança por um segundo módulo de segurança; - conexão de uma unidade de usuário a uma rede de transmissão; 6 - iniciação de uma comunicação entre o segundo módulo de segurança e um centro de gestão; - inserção através da unidade de usuário de um bloco de dados nos blocos transmitidos pelo segundo módulo, esse bloco compreendendo o identificador do primeiro módulo e os dados especificados para o referido primeiro módulo.
Esse método permite a recuperação de dados em um primeiro módulo, enquanto a conexão com o centro de gestão é feita graças ao segundo módulo de segurança. A troca de módulo de segurança representa uma oportunidade de solicitar que essa conexão inicie o novo módulo. A informação especifica representa todos os dados que são localmente gerados e, portanto, que são conhecidos para o centro de gestão. Além da informação relacionada a compras impulsivas, existem alguns contadores estatísticos no uso real da unidade de usuário ou descodif icador, bem como a informação relacionada às versões das funcionalidades do módulo de segurança.
Durante essa conexão, o descodificador irá constituir um bloco de dados cuja identificação será diferente dos outros blocos vindos do módulo de segurança. Um bloco é constituído por um cabeçalho compreendendo um único número do módulo de segurança e dados, em geral, criptados por uma 7 chave, que é ou uma chave de transmissão que é comum a todas as unidades de segurança ou uma chave pessoal, que é, para dizer, pertencente ao módulo de segurança. Essa chave pode ser do tipo assimétrica ou simétrica. O fluxo de dados irá, assim, compreender blocos cujo identificador é um do novo módulo de segurança e um bloco cujo identificador é um do módulo de segurança anterior. Esses blocos são transmitidos durante uma mesma sessão. A invenção será melhor compreendida graças à seguinte descrição detalhada, que se refere aos desenhos anexos dados como exemplos não limitativos, a saber: A figura 1 mostra os diferentes elementos da invenção. A figura 2 mostra o processamento de blocos de dados.
Na figura 1, o descodificador STB tem uma memória não volátil Ml. Essa memória será usada para armazenamento de dados vindos do módulo de segurança SC correntemente conectado. No nosso exemplo, o módulo de segurança SCI é retirado do descodificador STB e substituído por um novo módulo SC2.
De acordo com o modo de operação escolhido, os dados pertencentes ao módulo de segurança são exportados da memória M2 do módulo de segurança para uma memória Ml pretendida para esses dados, que são localizados no decodificador STB. Essa transferência pode ser realizada por exemplo, a cada vez que o conteúdo da memória M2 é modificado, ou em intervalo regular ou até mesmo por meio de um comando emitido a partir do centro de gestão.
Associado a esses dados, o módulo de segurança adiciona um identificador tal como um número único UA. Os dados são transmitidos a partir do módulo de segurança SC na direção da unidade de processamento MC do descodificador. Essa unidade gere a comunicação com o centro de gestão e o armazenamento de dados na memória Ml.
Os dados armazenados na memória Ml podem ser criptados por uma chave local especifica para o descodificador. Esses dados são, por exemplo, acompanhados por uma assinatura calculada pelo módulo de segurança SC e que autentica o conjunto de dados. Portanto, no caso da modificação dos mesmos no descodificador, o centro de gestão poderia facilmente detectar tal modificação. A assinatura usa uma chave assimétrica cuja parte correspondente está contida no centro de gestão. O identificador único permite encontrar a chave para descriptar a assinatura na memória segura do centro de gestão e verificar se os dados recebidos estão correctos.
Na figura 2, um exemplo dos blocos de dados BCS transmitidos na direcção do centro de gestão é divulgado.
Durante a conexão do descodificador ao centro de gestão, a 9 unidade de processamento MC solicita os dados para o módulo de segurança conectado SC e transmite os blocos BSC 2 vindos do módulo SC2. A unidade de processamento MC também irá recuperar os dados armazenados na memória Ml, que, no nosso caso, corresponde aos dados pertencentes ao módulo de segurança anterior SCI. Esses dados são transmitidos na forma do bloco BSC1.
De acordo com uma concretização, o centro de gestão CGS inclui um módulo de separação, que permite a classificação e o processamento apropriado dos blocos. De fato, o módulo de entrada é, em principio, configurado para verificar que cada bloco vem da mesma fonte e, assim, inclui o mesmo identificador. Por essa razão, é importante separar os blocos para processamento de uma forma convencional, pelo menos para a parte dos blocos BCS 2. O bloco BSC 1 terá um processamento especifico precisamente com o objetivo de recuperar a informação referente aos módulos de segurança não mais conectados.
De forma a evitar a perda de dados armazenados na memória do descodificador STB através da substituição de dados pertencentes ao novo módulo de segurança SC2, o centro de gestão dispõe de um controlo para activar, no módulo de segurança conectado ao descodificador, a operação de transferência de dados para o descodificador. 10
Portanto, durante a mudança de módulo, o novo módulo não é inicialmente autorizado a transferir os seus dados e os dados contidos na memória do mesmo Ml são representativos do módulo de segurança anterior. 5 O centro de gestão esperará por essa informação de acordo com o método acima descrito. Uma vez que essa informação é processada, o centro de gestão envia um comando para autorizar o módulo de segurança a transmitir as suas informações para o descodificador e, portanto, 10 actualizar os conteúdos da memória Ml.

Claims (6)

  1. REIVINDICAÇÕES 1) Método de armazenamento e transmissão de informação gerado por um primeiro módulo de segurança conectado a uma unidade de usuário, esse primeiro módulo de segurança compreendendo um único identificador e informação especifica representativa do funcionamento do mesmo, o primeiro módulo sendo capaz de ser substituído por um segundo módulo de segurança, método esse caracterizado pelo facto de compreender as seguintes etapas: - determinação da informação especifica contida no primeiro módulo de segurança pretendido para transmissão; transferência dessa informação na unidade de usuário; armazenamento dessa informação na unidade de usuário; - substituição do primeiro módulo de segurança por um segundo módulo de segurança; - conexão de uma unidade de usuário a uma rede de transmissão; - iniciação de uma comunicação entre o segundo módulo de segurança e um centro de gestão; - inserção através da unidade de usuário de um bloco de dados nos blocos transmitidos pelo segundo módulo, esse 2 bloco compreendendo o identificador do primeiro módulo e os dados especificados para o referido primeiro módulo.
  2. 2) Método de armazenamento e transmissão, de acordo com a reivindicação 1, caracterizado pelo facto de a transferência da informação especifica do primeiro módulo de segurança ser feita em intervalo regular.
  3. 3) Método de armazenamento e transmissão, de acordo com a reivindicação 1, caracterizado pelo facto de a transferência da informação especifica do primeiro módulo de segurança ser feita cada vez gue a referida informação é modificada.
  4. 4) Método de armazenamento e transmissão, de acordo com as reivindicações de 1 a 3, caracterizado pelo facto de a transferência da informação especifica ser interrompida após a substituição do primeiro módulo por um segundo módulo de segurança.
  5. 5) Método de armazenamento e transmissão, de acordo com as reivindicações de 1 a 3, caracterizado pelo facto de a transferência da informação ser autorizada assim que uma conexão bem sucedida com o centro de gestão for realizada.
  6. 6) Método de armazenamento e transmissão, de acordo com as reivindicações de 4, caracterizado pelo facto de a transferência da informação ser autorizada por um comando enviado pelo centro de gestão.
PT04708411T 2003-02-06 2004-02-05 MéTODO PARA ARMAZENAR E TRANSMITIR DADOS GERADOS POR UM MËDULO DE SEGURANÃA PT1590960E (pt)

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US5029207A (en) * 1990-02-01 1991-07-02 Scientific-Atlanta, Inc. External security module for a television signal decoder
US5144664A (en) * 1990-11-16 1992-09-01 General Instrument Corporation Apparatus and method for upgrading terminals to maintain a secure communication network
IL111151A (en) * 1994-10-03 1998-09-24 News Datacom Ltd Secure access systems
US6148081A (en) * 1998-05-29 2000-11-14 Opentv, Inc. Security model for interactive television applications
US6697489B1 (en) * 1999-03-30 2004-02-24 Sony Corporation Method and apparatus for securing control words
FR2793099A1 (fr) * 1999-04-28 2000-11-03 Dassault Automatismes Dispositif de communication a peage a double desembrouillage, notamment d'images de television
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WO2004071106A3 (fr) 2004-10-21
HK1082355A1 (en) 2006-06-02
RU2005124033A (ru) 2006-04-10
PL377663A1 (pl) 2006-02-06
MXPA05008173A (es) 2005-10-05
CN1748420A (zh) 2006-03-15
EP1590960B1 (fr) 2010-04-14
DE602004026541D1 (de) 2010-05-27
BRPI0407279A (pt) 2006-01-31
TW200507647A (en) 2005-02-16
US20060059507A1 (en) 2006-03-16
RU2339182C2 (ru) 2008-11-20
CA2514111C (fr) 2011-10-11
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AU2004209188B2 (en) 2008-10-09
CA2514111A1 (fr) 2004-08-19
AU2004209188A1 (en) 2004-08-19
ES2344107T3 (es) 2010-08-18
CN100466723C (zh) 2009-03-04
IL169780A0 (en) 2007-07-04
CN100466723K3 (pt)
KR101015725B1 (ko) 2011-02-22
WO2004071106A2 (fr) 2004-08-19
MY140257A (en) 2009-12-31
JP2006517045A (ja) 2006-07-13
ATE464744T1 (de) 2010-04-15

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