JP2010507328A - セキュアデバイス認証システム及び方法 - Google Patents
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- H04L9/3263—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 involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements
- H04L9/3265—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 involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements using certificate chains, trees or paths; Hierarchical trust model
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Abstract
Description
H(i, i, Y)=F(Yi)
H(i, j, Y)=F(H(i, (i+j-1)/2, Y), H((i+j+1)/2, j, Y))
但し、F(Yi)はSHA-1などの一方向関数である。従って、H(i, j, Y)は、Yi, Yi+1, ...Yjの一方向関数、H(1, n, Y)は、Y1〜Ynの一方向関数である。即ち、レシーバーはYkとHの一群の値を選択的に認証することが可能である。
H3: = H(1, 8, Y)
H2: = {H(l, 4, Y), H(5, 8, Y)}からなる値
H1: = {H(1, 2, Y), H(3, 4, Y), H(5, 6, Y), …}からなる値
H0: = {H(1, 1, Y), H(2, 2, Y), H(3, 3, Y), …}からなる値
従って、H0ハッシュはデータブロックY1、Y2などのハッシュや、二分木構造100の葉節点(leaf nodes)を言及している。ツリーの構造は、階層におけるレベルの数やツリー構造の各節点(node)の子の数によって定義しても良い。
1)秘密鍵を使用して、ブロックベースドメディアデバイス508を復号化すること、及び
2)ブロックベースドメディアデバイス508上の認証データを使用して、ブロックベースドメディアデバイス508上のコンテンツを認証すること(認証が失敗した場合、読み出しは失敗する)
200 非二分木構造
300 32KBブロック
302 ハッシュブロック
304 1KBデータブロック
310 H0ハッシュ/パディング
312 H1ハッシュ/パディング
314 H2ハッシュ/パディング
400 コンピュータ・システム
402 コンピュータ
404 I/Oデバイス
406 ディスプレイデバイス
408 プロセッサ
410 通信インターフェース
412 メモリ
414 ディスプレイコントローラ
416 不揮発性記憶装置
418 I/Oコントローラ
500 セキュアシステム
502 セキュアプロセッサ
504 OS(オペレーティングシステム)
506 ブロックベースドメディアドライバ
508 ブロックベースドメディアデバイス
510 プロテクト・メモリ
512 チケットサービス
514 セキュリティカーネル
516 鍵ストア
517 暗号化/復号化エンジン
518 セキュリティAPI
520 ヘッダアクセス矢印
522 認証データ矢印
524 鍵復号化要求矢印
526 鍵へのリファレンス矢印
528 チケット有効化矢印
530 データブロックアクセス矢印
532 ブロック復号化要求矢印
534 ハッシュツリー有効化矢印
Claims (21)
- データ構造とハッシュ値群とを含むヘッダにアクセスし、
前記データ構造から、階層的ハッシュツリーの第1のルートハッシュを獲得し、
前記ハッシュ値群から第2のルートハッシュを演算し、
前記第1のルートハッシュを、前記第2のルートハッシュと比較し、
第1のルートハッシュと第2のルートハッシュとが一致する場合に、
前記データ構造から、暗号化された鍵を獲得し、
前記暗号化された鍵をセキュアに復号化し、
前記鍵が平文の形で送付されないように、前記鍵をセキュアに格納し、
前記鍵にリファレンスを提供し、
前記データブロックを前記鍵への前記リファレンスで復号化し、
前記データブロックに関連するサブブロックから認証データを読み込み、
前記認証データにおいて、前記階層的ハッシュツリーの第1のレベルに関連する第1のハッシュ値群を識別し、
第1ハッシュ値を決定するために、前記データブロックの暗号学的ハッシュを演算し、
前記第1ハッシュ値を、前記第1ハッシュ値群における対応値と比較し、
前記第1ハッシュ値と、前記第1ハッシュ値群の前記対応値が一致しない場合に、ブロックデータの要求を拒絶することを特徴とする方法。 - 前記データ構造は署名された公開鍵であることを特徴とする請求項1に記載の方法。
- 更に、前記データ構造を認証することを特徴とする請求項1に記載の方法。
- 更に、ヘッダに含まれた前記ハッシュ値群をセキュアに格納することを特徴とする請求項1に記載の方法。
- 更に、前記階層的ハッシュツリーをキャッシュすることを特徴とする請求項1に記載の方法。
- 更に、前記第1のルートハッシュと前記第2のルートハッシュが一致していないならば、前記ヘッダを拒絶することを特徴とする請求項1に記載の方法。
- 更に、前記ヘッダ以外のソースから権利マネージメントチケットを有効にすることを特徴とする請求項1に記載の方法。
- 前記鍵への前記リファレンスは、平文で提供されることを特徴とする請求項1に記載の方法。
- 前記鍵への前記リファレンスでデータブロックを復号化する処理は、更に
セキュア復号化エンジンに対し前記鍵へのリファレンスを提供し、
前記鍵が平文で送付されないように、前記データブロックを復号化することを特徴とする請求項1に記載の方法。 - 更に、少なくとも前記サブブロックの一部を復号化することを特徴とする請求項1に記載の方法。
- 更に、各ハッシュブロックにおいて、
計算で求められたハッシュを適切なロケーションに挿入し、
前記ハッシュブロックのハッシュを演算することを特徴とする請求項1に記載の方法。 - 前記第1ハッシュ値が、前記第1のハッシュ値群の前記対応値と一致する場合、
前記第1のハッシュ値群に対応する第2ハッシュ値を演算し、
前記認証データにおいて、前記階層的ハッシュツリーの第2のレベルに関連する第2のハッシュ値群を識別し、
前記第2ハッシュ値を、前記第2のハッシュ値群における対応値と比較し、
前記第2ハッシュ値と、前記第2のハッシュ値群の前記対応値とが一致していない場合に、前記ブロックデータの要求を拒絶することを特徴とする請求項1に記載の方法。 - 前記第2ハッシュ値が、前記第2のハッシュ値群の前記対応値と一致する場合、
前記第2のハッシュ値群に対応する第3ハッシュ値を演算し、
前記認証データにおいて、前記階層的ハッシュツリーの第3のレベルに関連する第3のハッシュ値群を識別し、
前記第3ハッシュ値を、前記第3のハッシュ値群における対応値と比較し、
前記第3ハッシュ値と、前記第3のハッシュ値群の前記対応値とが一致していない場合に、前記ブロックデータの要求を拒絶することを特徴とする請求項12に記載の方法。 - 前記第3ハッシュ値が、前記第3のハッシュ値群の前記対応値と一致し、前記ヘッダのハッシュ値群が第4のハッシュ値群であり、前記第4ハッシュ値群が前記階層的ハッシュツリーの第4のレベルに関連する場合、
前記第3のハッシュ値群に対応する第4ハッシュ値を演算し、
前記階層的ハッシュツリーの第4のレベルに関連する第4のハッシュ値群を提供し、
前記第4ハッシュ値を、前記第4のハッシュ値群における対応値と比較し、
前記第4ハッシュ値と、前記第4のハッシュ値群の前記対応値とが一致していない場合に、前記ブロックデータの要求を拒絶し、
前記第4ハッシュ値と、前記第4のハッシュ値群の前記対応値とが一致している場合に、前記ブロックデータを戻すことを特徴とする請求項13に記載の方法。 - セキュリティAPIに接続されたブロックベースドメディアドライバであって、その動作において、ブロックベースドメディアデバイスに関連するヘッダにアクセスし、前記ヘッダから認証データを抽出するような前記ブロックベースドメディアドライバと、
前記セキュリティAPIと前記ブロックベースドメディアドライバに接続されるチケットサービスであって、その動作において、前記ブロックベースドメディアドライバからの前記認証データを受け取り、前記セキュリティAPIに鍵復号化要求を送るような前記チケットサービスと、
前記セキュリティAPI、暗号化/復号化エンジン、及び前記セキュリティAPIにアクセス可能な鍵ストアを含むセキュリティカーネルであって、その動作において、前記暗号化/復号化エンジンが鍵を復号化し、前記鍵は前記鍵ストアに格納され、前記セキュリティAPIは前記チケットサービスに、前記鍵に対するリファレンスを戻すような前記セキュリティカーネルとを備えるシステムであって、
動作において、前記チケッサービスは、前記認証データを有効化し、前記ブロックベースドメディアドライバに、前記鍵に対する前記リファレンスを戻し、
動作において、前記ブロックベースドメディアドライバは、前記ブロックベースドメディアデバイスのデータブロックにアクセスし、前記セキュリティAPIにブロック復号化要求を送り、前記セキュリティカーネルは、前記ブロックを復号化し、前記データブロックに関連する階層的ハッシュツリーを有効化することを特徴とするシステム。 - 更に、ブロックベースドメディアデバイスを更に備え、前記ブロックベースドメディアデバイスに関連するヘッダが、ルートハッシュ値と複数のルートの子のハッシュ値を含んでいることを特徴とする請求項15に記載のシステム。
- 更に、ブロックベースドメディアデバイスを更に備え、前記データブロックの各々は、ハッシュサブブロックと、複数のコンテンツデータブロックを含むことを特徴とする請求項15に記載のシステム。
- ブロックベースドメディアと共にセキュアコンテンツ配信のための手段を有するシステムであって、
セキュア鍵ストア手段と、
ブロックベースドメディアデバイスのヘッダから暗号化された鍵にアクセスするための手段と、
前記暗号化された鍵をセキュアに復号化するための手段と、
前記鍵ストアに前記鍵をセキュアに格納する手段と、
前記ブロックベースドメディアデバイスのデータブロックをセキュアに復号化するために、前記鍵にリファレンスを与えるための手段と、
前記ブロックベースドメディアデバイスと前記ブロックベースドメディアデバイスの各データブロックに関連するハッシュ値を提供するための手段とを備えることを特徴とするシステム。 - 前記ヘッダのハッシュ値が拒絶された場合に、前記ブロックベースドメディアデバイスへのアクセスを中止するための手段を更に備えることを特徴とする請求項18に記載のシステム。
- 前記データブロックのハッシュ値が拒絶された場合に、前記データブロックへのアクセスを中止するための手段を更に備えることを特徴とする請求項18に記載のシステム。
- データ構造とハッシュ値群とを含むヘッダにアクセスし、
前記データ構造から階層的なハッシュツリーの第1のルートハッシュを獲得し、
前記ハッシュ値群から第2のルートハッシュを演算し、
前記第1のルートハッシュを、前記第2のルートハッシュと比較し、
前記第1のルートハッシュと、第2ルートハッシュ値とが一致する場合に、
前記データ構造から、暗号化された鍵を獲得し、
前記暗号化された鍵を、セキュアに復号化し、
前記鍵が平文の形で送付されないように、前記鍵をセキュアに格納し、
前記鍵にリファレンスを提供し、
暗号化されたデータブロックに関連するサブブロックから認証データを読み込み、
前記認証データにおいて、前記階層的ハッシュツリーの第1のレベルに関連する第1のハッシュ値群を識別し、
第1ハッシュ値を決定するために、前記暗号化されたデータブロックの暗号学的ハッシュを演算し、
前記第1ハッシュ値を、前記第1ハッシュ値群における対応値と比較し、
前記第1ハッシュ値と、前記第1ハッシュ値群の前記対応値が一致しない場合に、ブロックデータの要求を拒絶し、
前記鍵に対するリファレンスで、前記暗号化されたデータブロックを復号化することを特徴とする方法。
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US20100031035A1 (en) | 2010-02-04 |
EP2080311A4 (en) | 2014-10-29 |
WO2008048403A2 (en) | 2008-04-24 |
EP2080311A2 (en) | 2009-07-22 |
EP2080311B1 (en) | 2019-11-27 |
US7624276B2 (en) | 2009-11-24 |
US7991999B2 (en) | 2011-08-02 |
US20080091945A1 (en) | 2008-04-17 |
JP5388855B2 (ja) | 2014-01-15 |
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