JP2013048009A - システムデータの検証がなされる方法、記憶媒体、記録装置及び再生装置 - Google Patents
システムデータの検証がなされる方法、記憶媒体、記録装置及び再生装置 Download PDFInfo
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Abstract
コピー保護における変更又は消去不可とすべき大量のデータ記憶である。
【解決手段】
記録可能データ領域にシステムデータが記憶され、読取専用固定データ領域中に識別データが記憶され、前記システムデータ及び前記識別データの暗号化概要が生成され、前記記録可能データ領域に記憶され、ユーザデータの読取及び/又は記録前に前記暗号化概要が前記システムデータの検証のために供給される、方法であって、前記暗号化概要を生成し、前記システムデータを検証するために、メッセージ認証コードアルゴリズムが用いられ、前記システムデータが、製造業者に特有の若しくはデバイスに特有の1つ以上の異なるキーにより暗号化されたキー、又は暗号解読キーによって表現される方法。
【選択図】図5
Description
・そのユーザが当該ディスクに記憶するデータを暗号化するのに用いられる特有のディスク識別番号
・製造業者別の又はデバイス別の複数の異なるキーにより暗号化された単一キーからなるリスト
・取り消されたデバイス又は取り消されたディスクの電子シリアル番号のリスト
がある。全てのブランクディスクにこのようなリストを記憶することによって、取消指令を民生デバイスに広めることができる。このような取消指令を受信すると、準拠デバイスは、取り消されたデバイスとの通信を拒絶するのである。
ED=E(ハッシュ化(システムデータ,識別データ),プライベートキー)と書くこともできる。ここで、EDはエキストラデータ(=暗号化概要)を、Eは公開キー暗号化を意味している。この計算されたディジタル署名は、その後に第2システムデータ領域32に暗号化概要として記憶される。
ED=E(システムデータ,固定データ,MACキー)
と書くことができる。ここでEDはエキストラデータ(=暗号化概要)を、EはMAC暗号化を意味する。
Claims (7)
- 読取専用固定データ領域及び記録可能データ領域を有する再書込可能データ記憶媒体にデータを記憶する方法であり、
・前記記録可能データ領域にシステムデータが記憶され、
・前記固定データ領域に識別データが記憶され、
・前記システムデータ及び前記識別データの暗号化概要が生成され、前記記録可能データ領域に記憶され、
・ユーザデータの読取及び/又は記録前に前記暗号化概要が前記システムデータの検証のために供給される、方法であって、
前記暗号化概要を生成し、前記システムデータを検証するために、メッセージ認証コードアルゴリズムが用いられ、
前記システムデータが、製造業者に特有の若しくはデバイスに特有の1つ以上の異なるキーにより暗号化されたキー、又は暗号解読キーによって表現される、ことを特徴とする方法。 - 読取専用固定データ領域であって、前記読取専用固定データ領域中に識別データが存在する読取専用固定データ領域及び記録可能データ領域を有する再書込可能データ記憶媒体にデータを記憶する方法であって、
・前記記録可能データ領域にシステムデータが記憶され、
・前記システムデータ及び前記識別データの暗号化概要が生成され、前記記録可能データ領域に記憶され、
・ユーザデータの読取及び/又は記録前に前記暗号化概要が前記システムデータの検証のために供給される、方法であって、
前記暗号化概要を生成し、前記システムデータを検証するために、メッセージ認証コードアルゴリズムが用いられ、
前記システムデータが、製造業者に特有の若しくはデバイスに特有の1つ以上の異なるキーにより暗号化されたキー、又は暗号解読キーによって表現される、ことを特徴とする方法。 - 請求項1又は2に記載の方法であって、前記暗号化概要が生成され、前記システムデータが前記記憶媒体のフォーマッティングの一部として前記記録可能データ領域に記憶される、ことを特徴とする方法。
- 請求項1又は2に記載の方法であって、前記システムデータは、前記記録可能データ領域のコーナ領域に初めから記憶され、記録装置における前記記憶媒体の最初の使用において、前記システムデータは、前記記録可能データ領域のユーザデータ領域にコピーされる、ことを特徴とする方法。
- データを記憶する記憶媒体であり、
・識別データが記憶される読取専用固定データ領域と、
・システムデータと前記システムデータ及び前記識別データの暗号化概要とが記憶される記録可能データ領域と、
を有し、前記暗号化概要は、ユーザデータの読取及び/又は記録前に前記システムデータの検証のために供給される、記憶媒体であって、
前記暗号化概要を生成するために、メッセージ認証コードアルゴリズムが用いられ、
前記システムデータが、製造業者に特有の若しくはデバイスに特有の1つ以上の異なるキーにより暗号化されたキー、又は暗号解読キーによって表現される、ことを特徴とする記憶媒体。 - 読取専用固定データ領域であって、前記読取専用固定データ領域中に識別データが存在する読取専用固定データ領域及び記録可能データ領域を有する再書込可能なデータ記憶媒体にデータを記憶する記録装置であり、
・システムデータ及び前記識別データの暗号化概要を生成する生成手段と、
・前記媒体の前記記録可能データ領域に前記暗号化概要と前記システムデータとを記憶する記録手段と、
を有し、前記暗号化概要は、ユーザデータの読取及び/又は記録前に前記システムデータの検証のために供給される、記録装置であって、
前記暗号化概要を生成し、前記システムデータを検証するために、メッセージ認証コードアルゴリズムが用いられ、
前記システムデータが、製造業者に特有の若しくはデバイスに特有の1つ以上の異なるキーにより暗号化されたキー、又は暗号解読キーによって表現される、ことを特徴とする記録装置。 - 読取専用固定データ領域であって、前記読取専用固定データ領域中に識別データが存在する読取専用固定データ領域、及び記録可能データ領域であって、前記記録可能データ領域中にシステムデータが前記システムデータ及び前記識別データの暗号化概要と一緒に存在する記録可能データ領域を有する再書込可能データ記憶媒体に記憶されるユーザデータの再生をなす再生装置であり、
・前記読取専用固定データ領域から前記識別データを読み取り、前記記録可能データ領域から前記システムデータと前記システムデータ及び前記識別データの暗号化概要とを読み取る読取手段と、
・前記媒体から読み取られた前記システムデータ及び前記識別データの暗号化概要を生成し、その生成された暗号化概要を用いて前記システムデータの検証を行う検証手段と、
を有する再生装置であって、
前記暗号化概要を生成し、前記システムデータを検証するために、メッセージ認証コードアルゴリズムが用いられ、
前記システムデータが、製造業者に特有の若しくはデバイスに特有の1つ以上の異なるキーにより暗号化されたキー、又は暗号解読キーによって表現される、ことを特徴とする再生装置。
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