JP2006506029A - デジタルコンテンツの転送を保護するためのメカニズム - Google Patents
デジタルコンテンツの転送を保護するためのメカニズム Download PDFInfo
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Abstract
Description
この実施形態においては、SKの有効期限を特定の期間に限定することもできる。デコーダ401はSKをメモリに記憶し、これによってSKがまだ有効でサービス鍵を再び要求する必要がない場合は、デコーダ401がサービスに再アクセスすることが可能になる。
合わせ鍵ジェネレータ621に対する暗号化演算により、合わせ鍵622と同一の鍵633が作られる。鍵633は2つのDESプロセスブロック6641及び6642にロードされる。プロセスブロック6641は、第1暗号化スクランブル解除鍵652を解読し、第1スクランブル解除鍵6651を作るために用いられる。プロセスブロック6642は、第1暗号化スクランブル解除鍵653を解読し、第2スクランブル解除鍵6652を作るために用いられる。DK6651及びDK6652は、スクランブルコンテンツ666をスクランブル解除するための低レベル3DESスクランブル解除論理回路667によって用いられる。
一般的に、第1プロセスブロック1330は、CAランダム1200及びSTB鍵1122に基づいてS鍵1124を生成する。第2プロセスブロック1330は、合わせ鍵ジェネレータ1205及びS鍵1124に基づいて合わせ鍵1335を生成する。第3プロセスブロック1360は、合わせ鍵1135を用いて、1つ又は2つ以上の暗号化制御ワード1210から再生された制御ワード1126を生成する。制御ワード1126は、例えば、ランダムアクセスメモリ、フラッシュメモリ、又はレジスタのような、1つ又は2つ以上の記憶コンポーネント1500に記憶される。
Claims (32)
- 固有鍵を記憶するための不揮発性メモリと、
(i)条件アクセス(CA)ランダム値及び前記固有鍵に基づいて生成される第1の値、(ii)前記第1の値を用いて生成される第2の値、及び(iii)前記第2の値を用いて再生される第3の値を生成するための制御ワード鍵ラダー論理回路と、
前記第3の値に基づいてスクランブルフォーマットの入力コンテンツをデスクランブルするための第1暗号ユニットと、
前記第1の値を用いて入力暗号化データを解読するための第2暗号ユニットと、
を備えることを特徴とするデスクランブラ。 - 単一の集積回路であることを特徴とする請求項1記載のデスクランブラ。
- セットトップボックスの内部に実装されることを特徴とする請求項1記載のデスクランブラ。
- 前記第1の値は、前記固有鍵を用いて前記CAランダム値の解読演算を行うことによって生成される派生鍵であることを特徴とする請求項1記載のデスクランブラ。
- 前記第1の値は、前記固有鍵を用いて前記CAランダム値とパディングデータの組合せの解読演算を行うことによって派生する派生鍵であり、前記組合せの長さが少なくとも128ビットであることを特徴とする請求項1記載のデスクランブラ。
- 前記第2の値は、前記派生鍵を用いて合わせ鍵ジェネレータの解読演算を行うことによって再生される合わせ鍵であり、前記合わせ鍵ジェネレータは、メーカー識別子、サービスプロバイダ識別子、条件アクセス(CA)プロバイダ識別子及び合わせ鍵シーケンス番号の1つ又は2つ以上を有するメッセージであることを特徴とする請求項4記載のデスクランブラ。
- 前記第2の値は、メーカー識別子、サービスプロバイダ識別子、条件アクセス(CA)プロバイダ識別子及び合わせ鍵シーケンス番号の1つ又は2つ以上を含むメッセージである合わせ鍵ジェネレータを含む少なくとも128ビットのデータを解読演算することによって再生される合わせ鍵であることを特徴とする請求項5記載のデスクランブラ。
- 前記第3の値は、前記合わせ鍵を用いて暗号化制御ワードの解読演算を行うことによって再生される制御ワードであることを特徴とする請求項6記載のデスクランブラ。
- 前記第3の値は、(i)前記合わせ鍵を用いた第1暗号化制御ワード及び第2暗号化制御ワードの第1の組合せに対する第1解読演算、及び(ii)前記合わせ鍵を用いた第3暗号化制御ワード及び長さが少なくとも128ビットとなる第2の組合せに対するパディングの役割を果たす複数のビットの第2の組合せに対する第2解読演算、を行うことによって再生される制御ワードであることを特徴とする請求項7記載のデスクランブラ。
- デジタル装置へ伝送する前に前記スクランブル解除入力コンテンツを暗号化するための第3暗号ユニットをさらに備えることを特徴とする請求項1記載のデスクランブラ。
- 前記スクランブル解除入力コンテンツを暗号化するために前記第3暗号ユニットによって用いられるコピープロテクト鍵を生成するためのコピープロテクトラダー論理回路をさらに備えることを特徴とする請求項10記載のデスクランブラ。
- 前記スクランブル解除入力コンテンツを暗号化するための前記第3暗号ユニットによって用いられるコピープロテクト鍵を生成するための前記コピープロテクトラダー論理回路は、固有鍵及び所定の値の排他的論理和(XOR)演算の結果値である論理導出を用いて、ランダム値と長さが少なくとも128ビットである結果値を作るための複数のビットとが連続したものの解読演算を行うことによって再生される制御ワードであることを特徴とする請求項11記載のデスクランブラ。
- デスクランブラにおいて、
(i)固有鍵を用いて第1ランダム値に対する暗号化演算から生成される第1の値、(ii)前記第1の値を用いて暗号化演算される合わせ鍵ジェネレータから再生される第2の値、及び(iii)前記第2の値を用いて暗号化制御ワードを解読することにより再生される制御ワード、を生成するための制御ワード鍵ラダー論理回路と、
前記制御ワードを用いてスクランブルフォーマットの入力コンテンツをスクランブル解除するための第1暗号ユニットと、
を備えることを特徴とするデスクランブラ。 - 単一の集積回路であることを特徴とする請求項13記載のデスクランブラ。
- 前記デスクランブラとともに実装されたデジタル装置によって帯域外受信された入力暗号化番組データを解読するための第2暗号ユニットをさらに備えることを特徴とする請求項13記載のデスクランブラ。
- 前記暗号化番組データは、(i)スマートカード識別子、(ii)長さフィールド、(iii)合わせ鍵ジェネレータ、(iv)少なくとも1つの鍵識別子、及び(v)前記少なくとも1つの鍵識別子と関連する少なくとも1つの鍵、のうちの少なくとも2つを含む暗号化資格管理メッセージを有することを特徴とする請求項15記載のスクランブラ。
- 前記暗号化資格管理メッセージの前記合わせ鍵ジェネレータは、メーカー識別子、サービスプロバイダ識別子、条件アクセス(CA)プロバイダ識別子及び合わせ鍵シーケンス番号の1つ又は2つ以上を含むメッセージであることを特徴とする請求項16記載のデスクランブラ。
- 複数のプロセスブロックに基づいてコピープロテクト鍵を生成するためのコピープロテクトラダー論理回路をさらに備え、前記複数のプロセスブロックは、
第2ランダム値及び前記固有鍵又は前記固有鍵の論理派生のいずれか1つに基づいて派生鍵を生成するために構成された第1プロセスブロックと、
前記派生鍵を用いて暗号化ユーザー鍵からユーザー鍵を再生するために構成された第2プロセスブロックと、
前記ユーザー鍵を用いてコピープロテクト鍵ジェネレータからコピープロテクト鍵を生成するために構成された第3プロセスブロック
であることを特徴とする請求項13記載のデスクランブラ。 - デジタル装置へ伝送する前に前記コピープロテクト鍵を用いて前記スクランブル解除入力コンテンツを暗号化するための第3暗号ユニットをさらに備えることを特徴とする請求項18記載のデスクランブラ。
- 前記制御ワード鍵ラダー論理回路及び前記コピープロテクトラダー論理回路に結合された1回のみプログラム可能な不揮発性メモリをさらに備え、前記不揮発性メモリは前記固有鍵を記憶するためのものであることを特徴とする請求項18記載のデスクランブラ。
- 前記コピープロテクト鍵を記憶するためのメモリをさらに備え、前記メモリが前記第3暗号ユニットに結合されていることを特徴とする請求項19記載のデスクランブラ。
- 固有鍵を記憶するためのメモリと、
前記メモリに結合され、
前記固有鍵の第1派生鍵を生成するために構成された第1プロセスブロック と、
前記派生鍵を用いて合わせ鍵ジェネレータから合わせ鍵を生成するために 構成された第2プロセスブロックと、
前記合わせ鍵を用いて暗号化制御ワードを解読することによって制御ワード を再生するために構成された第3プロセスブロックと、
を備える制御ワード鍵ラダー論理回路と、
前記制御ワード鍵ラダー論理回路に結合され、前記制御ワードを用いてスクランブルフォーマットの入力コンテンツをスクランブル解除するための第1暗号ユニットと、
備えることを特徴とするデスクランブラ。 - 単一の集積回路であることを特徴とする請求項22記載のスクランブラ。
- 前記デスクランブラとともに実装されたデジタル装置によって帯域外受信されえた入力暗号化番組データを解読するための第2暗号ユニットをさらに備えることを特徴とする請求項22記載のデスクランブラ。
- 前記暗号化番組データが、(i)スマートカード識別子、(ii)長さフィールド、(iii)合わせ鍵ジェネレータ、(iv)少なくとも1つの鍵識別子、及び(v)前記少なくとも1つの鍵識別子と関連する少なくとも1つの鍵の少なくとも2つを含む暗号化資格管理メッセージを含むことを特徴とする請求項24記載のスクランブラ。
- 前記第1暗号ユニットに結合されたコピープロテクトラダー論理回路をさらに備え、前記コピープロテクトラダー論理回路は、
ランダム値及び前記固有鍵又基づいて第2派生鍵を生成するために構成された第4プロセスブロックと、
ユーザー鍵を再生するための前記第2派生鍵を用いて暗号化ユーザー鍵を解読するために構成された第5プロセスブロックと、
前記ユーザー鍵を用いてコピープロテクト鍵ジェネレータからコピープロテクト鍵を生成するために構成された第6プロセスブロックと、
を備えることを特徴とする請求項22記載のデスクランブラ。 - デジタル装置へ伝送する前に前記コピープロテクト鍵を用いて前記スクランブル解除入力コンテンツを暗号化するための第2暗号ユニットをさらに備えることを特徴とする請求項26記載のデスクランブラ。
- 複数の固有鍵を記憶するための不揮発性メモリと、
(i)条件アクセス(CA)ランダム値及び対応する複数の固有鍵に基づいて生成される複数の派生鍵、(ii)前記複数の派生鍵を用いて生成される複数の合わせ鍵、及び(iii)前記複数の合わせ鍵を用いて再生される複数の制御ワード、を生成するための制御ワード鍵ラダー論理回路と、
前記複数の制御ワードの少なくとも1つに基づいてスクランブルフォーマットの入力コンテンツをスクランブル解除するための第1暗号ユニットと、
を備えることを特徴とするデスクランブラ。 - 前記複数の派生鍵は、
(i) 第1の結果値を生成するために前記複数の固有鍵の第1固有鍵を用いて前記CAランダムに対して行われる第1の変換、第2の結果値を生成するために前記複数の固有鍵の第2固有鍵を用いて前記第1の結果値に対して行われる第2の変換、及び前期第1派生鍵を生成するために前記複数の固有鍵の第3固有鍵を用いて前記第2の結果値に対して行われる第3の変換の少なくとも3つの変換を連続的に受ける前記CAランダム値によって生成される第1派生鍵と、
(ii) 第4の結果値を生成するためにビット毎論理演算される前記CAランダム及び第1の所定値によって生成され、その後、前記第4の結果値が第5の結果値を生成するために前記第1固有鍵を用いて前記第4の結果値に対して行われる第4の変換、第6の結果値を生成するために前記第2固有鍵を用いて前記第5の結果値に対して行われる第5の変換、及び第2派生鍵を生成するために前記第3固有鍵を用いて前記第6の結果値に対して行われる第6の変換の少なくとも3つの変換を連続的に受ける第2派生鍵と、
(iii) 第7の結果値を生成するためにビット毎論理演算される前記CAランダム及び前記第1の所定値とは異なる第2の所定値によって生成され、その後、前記第7の結果値が第8の結果値を生成ために前記第1固有鍵を用いて前記第7の結果値に対して行われる第7の変換、第9の結果値を生成するために前記第2固有鍵を用いて前記第8の結果値に対して行われる第8の変換、及び第3派生鍵を生成するために前記第3固有鍵を用いて前記第9の結果値に対して行われる第9の変換の少なくとも3つの変換を連続的に受ける第3派生鍵と、
を有することを特徴とする請求項28記載のデスクランブラ。 - 前記複数の合わせ鍵は、
(i) メーカー識別子、サービスプロバイダ識別子、条件アクセス(CA)プロバイダ識別子及び合わせ鍵シーケンス番号の1つ以上を含むメッセージである合わせ鍵ジェネレータによって生成され、第1の結果値を生成するために前記複数の派生鍵の第1派生鍵を用いて前記合わせ鍵ジェネレータに対して行われる第1の変換、第2の結果値を生成するために前記複数の派生鍵の第2派生鍵を用いて前記第1の結果値に対して行われる第2の変換、及び第1合わせ鍵を生成するために前記複数の派生鍵の第3派生鍵を用いて前記第2の結果値に対して行われる第3の変換の少なくとも3つの変換を連続的に受ける第1合わせ鍵と、
(ii) 第3の結果値を生成するためにビット毎論理演算される前記合わせ鍵及び第1の所定値によって生成され、その後、前記第3の結果値が第4の結果値を生成するために前記第1派生鍵を用いて前記第3の結果値に対して行われる第4の変換、第5の結果値を生成するために前記第2派生鍵を用いて前記第4の結果値に対して行われる第5の変換、及び第2合わせ鍵を生成するために前記第3派生鍵を用いて前記第5の結果値に対して行われる第6の変換の少なくとも3つの変換を連続的に受ける第2合わせ鍵と、
(iii) 第6の結果値を生成するためにビット毎論理演算される前記合わせ鍵及び前記第1の所定値とは異なる第2の所定値によって生成され、その後、前記第6の結果値が第7の結果値を生成するために前記第1派生鍵を用いて前記第6の結果値に対して行われる第7の変換、第8の結果値を生成するために前記第2派生鍵を用いて前記第7の結果値に対して行われる第8の変換、及び第3合わせ鍵を生成するために前記第3派生鍵を用いて前記第8の結果値に対して行われる第9の変換の少なくとも3つの変換を連続的に受ける第3合わせ鍵と、
を有することを特徴とする請求項28記載のデスクランブラ。 - 前記複数の制御ワードが、
(i) 第1の結果値を生成するために前記複数の合わせ鍵の第1合わせ鍵を用いて第1暗号化制御ワードに対して行われる第1の変換、第2の結果値を生成するために前記複数の合わせ鍵の第2合わせ鍵を用いて前記第1の結果値に対して行われる第2の変換、及び第1制御ワードを生成するために前記複数の合わせ鍵の第3合わせ鍵を用いて前記第2の結果値に対して行われる第3の変換の少なくとも3つの変換を連続的に受ける第1暗号化制御ワードから再生される第1制御ワードと、
(ii) 第3の結果値を生成するためにビット毎論理演算される第2暗号化制御ワード及び第1の所定値から再生され、その後、前記第3の結果値が第4の結果値を生成するために前記第1合わせ鍵を用いて前記第3の結果値に対して行われる第4の変換、第5の結果値を生成するために前記第合わせ鍵を用いて前記第4の結果値に対して行われる第5の変換、及び第2制御ワードを生成するために前記第3合わせ鍵を用いて前記第5の結果値に対して行われる第6の変換の少なくとも3つの変換を連続的に受ける第2制御ワードと、
(iii) 第6の結果値を生成するためにビット毎論理演算される第3暗号化制御ワード及び第2の所定値から再生され、その後、前記第6の結果値が第7の結果値を生成するために前記第1合わせ鍵を用いて前記第6の結果値に対して行われる第7の変換、第8の結果値を生成するために前記第2合わせ鍵を用いて前記第7の結果値に対して行われる第8の変換、及び第3制御ワードを生成するために前記第3合わせ鍵を用いて前記第8の結果値に対して行われる第9の変換の少なくとも3つの変換を連続的に受ける第3制御ワードと、
を含むことを特徴とする請求項28記載のデスクランブラ。 - ビット毎論理演算が排他的OR演算であることを特徴とする請求項30記載のデスクランブラ。
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JPH0997295A (ja) * | 1995-07-21 | 1997-04-08 | General Instr Corp Of Delaware | パッケージされた情報サービスをインパルス購入するための方法及び装置 |
JPH1011117A (ja) * | 1996-06-20 | 1998-01-16 | Keyence Corp | プログラマブルコントローラ |
JP2000357005A (ja) * | 1999-06-16 | 2000-12-26 | Hitachi Ltd | プログラマブルコントローラ |
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JP2008516551A (ja) * | 2004-10-11 | 2008-05-15 | ソニー エレクトロニクス インク | デスクランブル方法及びデスクランブル装置 |
JP2012510743A (ja) * | 2008-12-01 | 2012-05-10 | イルデト・ベー・フェー | 追加キーレイヤーを用いたコンテンツ復号化装置および暗号化システム |
JP2011155642A (ja) * | 2010-01-26 | 2011-08-11 | Irdeto Corporate Bv | 制御語を受信装置において変換を用いて計算的に効率よく取得すること |
US9106795B2 (en) | 2010-01-26 | 2015-08-11 | Irdeto B.V. | Computational efficiently obtaining a control word in a receiver using transformations |
Also Published As
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US7711115B2 (en) | 2010-05-04 |
US7920703B2 (en) | 2011-04-05 |
US8379853B2 (en) | 2013-02-19 |
US20040086127A1 (en) | 2004-05-06 |
US7724907B2 (en) | 2010-05-25 |
US7508942B2 (en) | 2009-03-24 |
US20090168996A1 (en) | 2009-07-02 |
CN1736056B (zh) | 2011-07-06 |
CN1736056A (zh) | 2006-02-15 |
US20110299683A1 (en) | 2011-12-08 |
JP4716866B2 (ja) | 2011-07-06 |
US20040088558A1 (en) | 2004-05-06 |
US20040088552A1 (en) | 2004-05-06 |
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