JP4855498B2 - 公開鍵メディア鍵束 - Google Patents
公開鍵メディア鍵束 Download PDFInfo
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- JP4855498B2 JP4855498B2 JP2009119898A JP2009119898A JP4855498B2 JP 4855498 B2 JP4855498 B2 JP 4855498B2 JP 2009119898 A JP2009119898 A JP 2009119898A JP 2009119898 A JP2009119898 A JP 2009119898A JP 4855498 B2 JP4855498 B2 JP 4855498B2
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00188—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00224—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is obtained from a remote server
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
- G11B20/00362—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being obtained from a media key block [MKB]
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
- G11B20/00492—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
- G11B20/00492—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted
- G11B20/00528—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file
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- 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
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- 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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- 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
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0894—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
- H04L9/0897—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage involving additional devices, e.g. trusted platform module [TPM], smartcard or USB
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/60—Digital content management, e.g. content distribution
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Storage Device Security (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Description
本発明の実施例は、公開鍵メディア鍵束及び暗号化されたコンテンツを、コンテンツ生産者から再生装置に、暗号化されたコンテンツへのアクセスを得るために使用する暗号化鍵は無効にされ得るが再生装置の匿名性はサポートされるよう分配する方法及び装置を含む。本発明の実施例は、DVDといった記憶媒体上のコンテンツの分配の非インタラクティブのオフラインチャネルと、ラジオ及びテレビジョン(TV)といった一方向チャネルに有用であり得る。
L>(In(EV)−In(M))/(In(R)−In(N))
本発明の実施例についての匿名性の利点は、オンラインのオーダメイドのコンテンツが、顧客の識別情報(誰か単一の公開鍵を供給するのか)を明らかにしないことを含む。鍵は、多くの装置に属することが可能である。各加入者が公開鍵を提供し、コンテンツが、一人以上の加入者に属するこれらの鍵に対してのみ暗号化される加入者リストシナリオについても同じことが言える。全ての鍵が使用されるブロードキャストシナリオについては、匿名性の問題はない。即ち、全ての人が潜在的にコンテンツを入手し、コンテンツへのアクセスは、別の機構によって保護されるからである(例えば、CD販売、ケーブル加入等)。
Claims (1)
- 非対称鍵対からの異なる公開鍵で暗号化された複数の対称コンテンツ鍵を含む公開鍵メディア鍵束と、コンテンツに固有な前記対称コンテンツ鍵で暗号化されたコンテンツとを含む保護コンテンツを記憶したコンピュータ読み取り可能な記憶媒体であって、
当該コンピュータ読み取り可能な記憶媒体がコンピュータによりアクセスされたとき、前記コンピュータの選択手段により、該コンピュータに記憶されているL個の秘密鍵からなる固有のセットから第1の秘密鍵が選択され、前記L個の秘密鍵からなる固有のセットは、L,J及びNを自然数として、N個の非対称鍵対から形成されたJ個の秘密鍵のセットのうちから選択されて前記コンピュータの記憶手段に記憶されており、
前記コンピュータの第1の復号化手段により、前記第1の秘密鍵を使用して、前記暗号化された複数の対称コンテンツ鍵のうちの第1の対称コンテンツ鍵が復号化され、
前記コンピュータの第2の復号化手段により、復号化された第1の対称コンテンツ鍵を使用して、前記暗号化されたコンテンツが復号化され、
前記コンピュータの再生手段により、前記復号化されたコンテンツが再生される、
ことを特徴とするコンピュータ読み取り可能な記憶媒体。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/316,595 US7305711B2 (en) | 2002-12-10 | 2002-12-10 | Public key media key block |
US10/316,595 | 2002-12-10 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004559114A Division JP4494215B2 (ja) | 2002-12-10 | 2003-11-06 | 公開鍵メディア鍵束 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009219141A JP2009219141A (ja) | 2009-09-24 |
JP4855498B2 true JP4855498B2 (ja) | 2012-01-18 |
Family
ID=32468895
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004559114A Expired - Fee Related JP4494215B2 (ja) | 2002-12-10 | 2003-11-06 | 公開鍵メディア鍵束 |
JP2009119898A Expired - Fee Related JP4855498B2 (ja) | 2002-12-10 | 2009-05-18 | 公開鍵メディア鍵束 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004559114A Expired - Fee Related JP4494215B2 (ja) | 2002-12-10 | 2003-11-06 | 公開鍵メディア鍵束 |
Country Status (8)
Country | Link |
---|---|
US (2) | US7305711B2 (ja) |
EP (1) | EP1570475A2 (ja) |
JP (2) | JP4494215B2 (ja) |
KR (1) | KR100692344B1 (ja) |
CN (2) | CN1723501B (ja) |
AU (1) | AU2003295467A1 (ja) |
TW (1) | TWI233289B (ja) |
WO (1) | WO2004053867A2 (ja) |
Families Citing this family (109)
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AU2003295467A1 (en) | 2004-06-30 |
CN101977108A (zh) | 2011-02-16 |
CN101977108B (zh) | 2013-08-21 |
US7305711B2 (en) | 2007-12-04 |
TWI233289B (en) | 2005-05-21 |
WO2004053867A2 (en) | 2004-06-24 |
CN1723501B (zh) | 2010-12-01 |
US20040109569A1 (en) | 2004-06-10 |
JP2009219141A (ja) | 2009-09-24 |
WO2004053867A3 (en) | 2004-09-23 |
AU2003295467A8 (en) | 2004-06-30 |
JP4494215B2 (ja) | 2010-06-30 |
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