JP5021078B2 - 公的にアクセス可能なストレージからデータ処理マシンの状態に関するプライベートデータへのアクセス - Google Patents
公的にアクセス可能なストレージからデータ処理マシンの状態に関するプライベートデータへのアクセス Download PDFInfo
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- JP5021078B2 JP5021078B2 JP2011000154A JP2011000154A JP5021078B2 JP 5021078 B2 JP5021078 B2 JP 5021078B2 JP 2011000154 A JP2011000154 A JP 2011000154A JP 2011000154 A JP2011000154 A JP 2011000154A JP 5021078 B2 JP5021078 B2 JP 5021078B2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/14—Protection against unauthorised use of memory or access to memory
- G06F12/1408—Protection against unauthorised use of memory or access to memory by using cryptography
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
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- Mathematical Physics (AREA)
- Storage Device Security (AREA)
Description
たとえば、アプリケーションが1つのプロセッサの実現で利用可能な特定のプライベートステータスデータに依存する場合、アプリケーションがプライベートステータスを異なって実現する(又は全く実現しない)異なるプロセッサの実現で実行されるときに誤って機能する場合がある。プライベートデータに依存するソフトウェアは、実現から実現まで変化する内部プロセッサ−メモリ間の可干渉性の挙動/ポリシーのために失敗する場合がある。プライベートステータスデータへのソフトウェアの依存性は、プライベートステータスの使用に関してプロセッサの製造業者にとって利用可能な実現の代替を複雑にするか、及び/又はぐらつきながら歩く場合がある。したがって、プロセッサの製造業者は、将来的な実現で変化を受けることを示すRESERVEDとしてかかるプライベートデータを提供する(メモリ領域にそのストレージを提供する)。
Si(t+1)=Si-1(t)+Ii+(Pi・Sw-1(t)),1≦i≦w−1
S0(t+1)=I0+(P0・Sw-1(t))
ここで、演算子“+”は法2の加算(XOR)を表し、“・”は法2の乗算(AND)を表す。パラメータ“t”は時間(クロックチック)を表し、Siはi番目のフリップフロップの状態であり、Iiはi番目の入力ベクトルビットであり、Piはi番目の多項式計数である。Pw係数は暗黙的に1である。図4のアドレス混合の実施の形態を達成するため、全てのSi(t)を対応するアドレスAi値で置き換え、Si(t+1)を出力Oiで置き換える。他の実施の形態も可能である。
フィードバックシフトレジスタ技術の変形(線形、非線形、多入力等)は、初期速度で使用される場合がある。初期速度は、フィードバックシフトレジスタにロードされる初期状態であるとして定義される。連続したそれぞれのデータ値について、シフトレジスタが進められ、その内容は、初期レジスタのコンテンツに対してビット毎にXORされる。これは、ビジュネル暗号と呼ばれ、この例は、テーブル470においてそれぞれエンコードされていないコンテンツ(データ)はゼロである(たとえばエントリ471)先の図4のテーブル470,480で示されるが、メモリ408におけるテーブル(たとえばエントリ481)においてエンコードされた形式で記憶されたときのように現れない。
この暗号によれば、ビット毎のXORマスクの擬似ランダム系列を発生するため、シフトレジスタが使用される。このケースでは、それぞれの擬似ランダムなビット毎のマスクがMISRにより生成されるので(ステップ480参照)、アドレス系列における次のデータ値とビット毎にXORされる。正確に同じ系列を再生するため、多項式及びイニシャルシフトレジスタの速度値のみが必要とされる。
実施の形態では、エンコード及び/又はデコードユニットのコンフィギュレーション情報(たとえば多項式及び初期速度)は、メモリ408におけるエンコードされた状態領域と共に記憶される。プライベート状態をデコードするため、コンフィギュレーション情報(たとえば多項式及び初期速度)が回復され(及びおそらく、別の固定されたエンコード技術を使用してデコードされ)、次いで使用される。それぞれの系列におけるマスクが同じ順序で対応するデータに印加される限り(たとえば、アドレス可能なデータユニット当たり1つのマスクが適用され)、ビット毎のXORマスキングがオリジナルデータを生成(デコード)する。
前に記載されたように、多項式及び初期のMISR速度値は、各種の方法又は変化の制約を使用して変わる場合がある(たとえばブート時間、ラン時間等)。オリジナルデータを回復するため、オリジナルで使用されたエンコード方法に適したデコード方法が適用されるべきであり、すなわちエンコードを元通りにするために適用される。ビジュネル暗号は、プライベートステータスデータ値のエンコードメカニズムのまさに1つの例であり、このエンコードメカニズムは、効率的であって、シンプルなバイナリ係数リスト、速度等でのプログラム可能性“programability”、及び数ゲートの遅延をもつ控えめな量のハードウェアを許容する。他の実施の形態も可能である。
122:オペレーティングシステム
124:アプリケーションソフトウェア
110:プロセッサ
114:レジスタ
130:ストレージ
140:入力/出力装置
102:プラットフォームハードウェア
Claims (2)
- プロセッサと、
前記プロセッサのプライベートステータスを示すデータエレメントを記憶する記憶手段とを備えるコンピュータシステムであって、
前記プロセッサは、前記データエレメントがエンコードされる必要があると判定したときに前記データエレメントをエンコードし、前記プロセッサによる前記判定に応答して発生されるアドレス値をエンコードし、エンコードされたデータエレメントを、前記記憶手段における前記アドレス値に対応する位置に記憶し、
前記プロセッサは、エンコードされたアドレス値をデコードし、前記記憶手段における前記アドレス値に対応する位置から前記エンコードされたデータエレメントを読み出し、前記記憶手段の前記位置から読み出された前記エンコードされたデータエレメントをデコードすることで、前記エンコードされたデータエレメントをデコードする、
ことを特徴とするコンピュータシステム。 - プロセッサと、前記プロセッサのプライベートステータスを示すデータエレメントを記憶する記憶手段とを有するコンピュータシステムの動作方法であって、
当該方法は、
前記データエレメントがエンコードされる必要があると判定したときに、前記データエレメントを前記プロセッサがエンコードし、前記プロセッサによる前記判定に応答して発生されるアドレス値を前記プロセッサがエンコードして、エンコードされたデータエレメントを、前記記憶手段における前記アドレス値に対応する位置に記憶するステップと、
エンコードされたアドレス値を前記プロセッサがデコードし、前記記憶手段における前記アドレス値に対応する位置から前記エンコードされたデータエレメントを前記プロセッサが読み出し、前記記憶手段の前記位置から読み出された前記エンコードされたデータエレメントを前記プロセッサが前記デコードすることで、前記エンコードされたデータエレメントをデコードするステップと、
を含むことを特徴とするコンピュータシステムの動作方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/724,321 | 2003-11-26 | ||
US10/724,321 US8156343B2 (en) | 2003-11-26 | 2003-11-26 | Accessing private data about the state of a data processing machine from storage that is publicly accessible |
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JP2006541379A Division JP2007515709A (ja) | 2003-11-26 | 2004-11-07 | 公的にアクセス可能なストレージからデータ処理マシンの状態に関するプライベートデータへのアクセス |
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JP2011076632A JP2011076632A (ja) | 2011-04-14 |
JP5021078B2 true JP5021078B2 (ja) | 2012-09-05 |
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JP2006541379A Pending JP2007515709A (ja) | 2003-11-26 | 2004-11-07 | 公的にアクセス可能なストレージからデータ処理マシンの状態に関するプライベートデータへのアクセス |
JP2011000154A Expired - Fee Related JP5021078B2 (ja) | 2003-11-26 | 2011-01-04 | 公的にアクセス可能なストレージからデータ処理マシンの状態に関するプライベートデータへのアクセス |
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JP2006541379A Pending JP2007515709A (ja) | 2003-11-26 | 2004-11-07 | 公的にアクセス可能なストレージからデータ処理マシンの状態に関するプライベートデータへのアクセス |
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US (3) | US8156343B2 (ja) |
JP (2) | JP2007515709A (ja) |
KR (1) | KR100974973B1 (ja) |
CN (1) | CN1886711B (ja) |
DE (1) | DE112004002259B4 (ja) |
WO (1) | WO2005055024A1 (ja) |
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US8156343B2 (en) | 2012-04-10 |
JP2011076632A (ja) | 2011-04-14 |
DE112004002259B4 (de) | 2013-06-06 |
US9087000B2 (en) | 2015-07-21 |
JP2007515709A (ja) | 2007-06-14 |
CN1886711A (zh) | 2006-12-27 |
KR20060090296A (ko) | 2006-08-10 |
CN1886711B (zh) | 2014-07-23 |
US20130275772A1 (en) | 2013-10-17 |
WO2005055024A1 (en) | 2005-06-16 |
US20130067184A1 (en) | 2013-03-14 |
US20050114610A1 (en) | 2005-05-26 |
US9348767B2 (en) | 2016-05-24 |
KR100974973B1 (ko) | 2010-08-09 |
DE112004002259T5 (de) | 2006-10-26 |
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