JP2005512468A - ブロードキャスト・コンテンツへのアクセス - Google Patents
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- H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
- H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
- H04H60/23—Arrangements for conditional access to broadcast information or to broadcast-related services using cryptography, e.g. encryption, authentication, key distribution
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- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
- H04L9/0825—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
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- H04L9/083—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
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- 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]
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- H04N21/26613—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 keys in general
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- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6377—Control signals issued by the client directed to the server or network components directed to server
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Abstract
【解決手段】 コンテンツ・プロバイダ・サブシステムでは、コンテンツ項目を暗号化して暗号化されたコンテンツ項目を生成し、ブロッキングnonceを生成し、クリアリング・ハウス・サブシステムに伝送し、暗号化されたコンテンツ項目とブロッキングnonceを受信機サブシステムに伝送する。クリアリング・ハウス・サブシステムでは、ブロッキングnonceに基づいて二重に暗号化されたコンテンツ・キーを暗号化解除して公開キーで暗号化されたコンテンツ・キーを回復し、公開キーと秘密キーのペアの秘密キーに基づいて公開キーで暗号化されたコンテンツ・キーでコンテンツ・キーを回復し、コンテンツ・キーに基づいて暗号化されたコンテンツ項目を暗号化解除して要求されたコンテンツ項目を回復する。
Description
160によってコンテンツ・キーKi130を暗号化することによって生成された内部暗号化層230と、ブロッキングnonceBi140によって公開キーで暗号化されたコンテンツ・キーを暗号化することによって生成された外部暗号化層240とによって保護されたコンテンツ・キーKi130と見なすことができる。
ε(Ki,パブリックK)をさらに暗号化して、二重に暗号化されたコンテンツ・キー
ε(ε(Ki,パブリックK),Bi)190を生成する。次にクリアリング・ハウス・サブシステム100は、通信経路200が示すようにネットワーク50を介して受信機サブシステム110に二重に暗号化されたコンテンツ・キーε(ε(Ki,パブリックK),Bi)190を送信する。本明細書で前述した本発明の実施形態では、二重暗号化は、1対の同様の暗号化操作ε(.,.)によって提供されるものとして示されている。しかし、本発明の他の実施形態では、二重暗号化は2通りの暗号化操作によって実行することができる。また、本発明の他の実施形態では、3つ以上の暗号化層にコンテンツ・キーを入れることができることも分かるだろう。
によって要求されたコンテンツ・キーKiを暗号化し、対応するブロッキングnonceBiによって暗号化されたコンテンツ・キーを暗号化する。
Claims (10)
- コンテンツ・プロバイダ・サブシステムからブロードキャストされたコンテンツ項目に対してクリアリング・ハウス・サブシステムを介して受信機サブシステムがアクセスできるようにするための方法において、前記方法が、
前記コンテンツ・プロバイダ・サブシステムにおいて、コンテンツ・キーに基づいて前記コンテンツ項目を暗号化して暗号化されたコンテンツ項目を生成するステップと、前記コンテンツ・キーに対応するブロッキングnonceを生成するステップと、前記コンテンツ・キーと前記ブロッキングnonceを前記クリアリング・ハウス・サブシステムに伝送するステップと、前記暗号化されたコンテンツ項目と前記ブロッキングnonceを前記受信機サブシステムに伝送するステップと、
前記クリアリング・ハウス・サブシステムにおいて、前記コンテンツ・プロバイダ・サブシステムから前記コンテンツ・キーと前記ブロッキングnonceを受信するステップと、前記受信機サブシステムの公開キーと秘密キーのペアのうちの公開キーを受信するステップと、前記コンテンツ項目へのアクセスを求める要求に応答して、前記公開キーに基づいて前記コンテンツ・キーを暗号化して公開キーで暗号化されたコンテンツ・キーを生成するステップと、前記ブロッキングnonceに基づいて前記公開キーで暗号化されたコンテンツ・キーを暗号化して二重に暗号化されたコンテンツ・キーを生成するステップと、前記二重に暗号化されたコンテンツ・キーを前記受信機サブシステムに伝送するステップと、
前記受信機サブシステムにおいて、前記クリアリング・ハウス・サブシステムから前記二重に暗号化されたコンテンツ・キーを受信するステップと、前記コンテンツ・プロバイダ・サブシステムから前記暗号化されたコンテンツ項目と前記ブロッキングnonceを受信するステップと、前記ブロッキングnonceに基づいて前記二重に暗号化されたコンテンツ・キーを暗号化解除して前記公開キーで暗号化されたコンテンツ・キーを回復するステップと、前記公開キーと秘密キーのペアのうちの秘密キーに基づいて前記公開キーで暗号化されたコンテンツ・キーを暗号化解除して前記コンテンツ・キーを回復するステップと、前記コンテンツ・キーに基づいて前記暗号化されたコンテンツ項目を暗号化解除して前記要求されたコンテンツ項目を回復するステップとを含む、方法。 - 前記受信機サブシステムにおいてアクセスを求める前記要求を生成するステップを含む、請求項1に記載の方法。
- 前記受信機サブシステムにおいて、前記公開キーと秘密キーのペアのうちの前記秘密キーに基づいてアクセスを求める前記要求を暗号化するステップを含む、請求項2に記載の方法。
- ブロードキャスト・コンテンツ項目に対してアクセスできるようにするための装置において、前記装置が、
公開キーと秘密キーのペアを有する受信機サブシステムと、
コンテンツ・キーに基づいて前記コンテンツ項目を暗号化して暗号化されたコンテンツ項目を生成するための第1の暗号化ユニットと、前記コンテンツ・キーに対応するブロッキングnonceを生成するためのnonceジェネレータと、前記暗号化ユニットおよび前記nonceジェネレータに接続され、前記コンテンツ・キー、前記ブロッキングnonce、および前記暗号化されたコンテンツ項目を伝送するための第1の送信機とを有するコンテンツ・プロバイダ・サブシステムと、
前記コンテンツ・プロバイダ・サブシステムからの前記コンテンツ・キーおよび前記ブロッキングnonceと前記受信機サブシステムの前記公開キーとを受信するための第1の受信機と、前記第1の受信機に接続され、前記コンテンツ項目へのアクセスを求める要求に応答して、前記公開キーに基づいて前記コンテンツ・キーを暗号化して公開キーで暗号化されたコンテンツ・キーを生成し、前記ブロッキングnonceに基づいて前記公開キーで暗号化されたコンテンツ・キーを暗号化して二重に暗号化されたコンテンツ・キーを生成するための第2の暗号化ユニットと、前記第2の暗号化ユニットに接続され、前記二重に暗号化されたコンテンツ・キーを前記受信機サブシステムに伝送するための第2の送信機とを有するクリアリング・ハウス・サブシステムとを含み、
前記受信機サブシステムが、前記クリアリング・ハウス・サブシステムからの前記二重に暗号化されたコンテンツ・キーと、前記コンテンツ・プロバイダ・サブシステムからの前記暗号化されたコンテンツ項目および前記ブロッキングnonceとを受信するための第2の受信機と、前記受信機に接続され、前記ブロッキングnonceに基づいて前記二重に暗号化されたコンテンツ・キーを暗号化解除して前記公開キーで暗号化されたコンテンツ・キーを回復し、前記公開キーと秘密キーのペアのうちの秘密キーに基づいて前記公開キーで暗号化されたコンテンツ・キーを暗号化解除して前記コンテンツ・キーを回復し、前記コンテンツ・キーに基づいて前記暗号化されたコンテンツ項目を暗号化解除して前記要求されたコンテンツ項目を回復するための暗号化解除ユニットとをさらに含む、装置。 - 前記受信機サブシステムが、アクセスを求める前記要求を生成するように配置される、請求項4に記載の装置。
- 前記受信機サブシステムが、前記公開キーと秘密キーのペアのうちの前記秘密キーに基づいてアクセスを求める前記要求を暗号化するように配置される、請求項5に記載の方法。
- 請求項4ないし6のいずれかに記載の装置の受信機サブシステム。
- 請求項4ないし6のいずれかに記載に装置のコンテンツ・プロバイダ・サブシステム。
- 請求項4ないし6のいずれかに記載の装置のクリアリング・ハウス・サブシステム。
- 請求項4ないし6のいずれかに記載の装置を含む、ディジタル・オーディオ・ブロードキャスト・システム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01129413 | 2001-12-10 | ||
PCT/IB2002/005230 WO2003051056A1 (en) | 2001-12-10 | 2002-12-10 | Access to encrypted broadcast content |
Publications (2)
Publication Number | Publication Date |
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JP2005512468A true JP2005512468A (ja) | 2005-04-28 |
JP4086782B2 JP4086782B2 (ja) | 2008-05-14 |
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Application Number | Title | Priority Date | Filing Date |
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JP2003551997A Expired - Fee Related JP4086782B2 (ja) | 2001-12-10 | 2002-12-10 | ブロードキャスト・コンテンツへのアクセス |
Country Status (6)
Country | Link |
---|---|
US (1) | US7248694B2 (ja) |
EP (1) | EP1452027B1 (ja) |
JP (1) | JP4086782B2 (ja) |
AU (1) | AU2002366686A1 (ja) |
DE (1) | DE60213650T2 (ja) |
WO (1) | WO2003051056A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2021069084A (ja) * | 2019-10-28 | 2021-04-30 | ラディウス株式会社 | ストリーミングデータの再生装置、ストリーミングデータの配信システム、及び、ストリーミングデータの生成再生方法 |
Families Citing this family (68)
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US20040167857A1 (en) * | 1995-12-20 | 2004-08-26 | Nb Networks | Systems and methods for prevention of peer-to-peer file sharing |
US9100457B2 (en) | 2001-03-28 | 2015-08-04 | Qualcomm Incorporated | Method and apparatus for transmission framing in a wireless communication system |
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JP2021069084A (ja) * | 2019-10-28 | 2021-04-30 | ラディウス株式会社 | ストリーミングデータの再生装置、ストリーミングデータの配信システム、及び、ストリーミングデータの生成再生方法 |
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WO2003051056A1 (en) | 2003-06-19 |
DE60213650T2 (de) | 2007-08-09 |
AU2002366686A1 (en) | 2003-06-23 |
JP4086782B2 (ja) | 2008-05-14 |
EP1452027A1 (en) | 2004-09-01 |
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