JP2011238246A - 電子メモリ改竄防止システム - Google Patents
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Abstract
【解決手段】メモリ及び処理手段を有する電子装置が論理を含み、この論理は装置のメモリ内容に片方向ハッシュ計算を遂行するために使用され、それによって、このような内容の監査ハッシュ値、又はシグネチャが導出される。監査ハッシュ値は、真正メモリ内容から導出された認証された有効ハッシュ値と比較される。監査ハッシュ値と有効ハッシュ値との間の相違がメモリ改竄を示すことができる。電子装置メモリ内容を、そのメモリ内容にアクセスを許される前に認証されるデータ転送装置によって更新することができる。データ転送装置認証は、公開鍵/秘密鍵暗号化方式の使用に係わる。データ転送装置が電子装置とインタフェースしかつメモリ・アクセスをリクエストするとき、データ転送装置を認証するプロセスが開始される。
【選択図】なし
Description
詐欺による使用を防止する他の技術が提案されている。例えば、特許文献1は、サービス通信事業者(service carrier)との専用通信端末に識別番号を登録する方法を説明している。特許文献2は、携帯電話内の番号割り当てモジュールの違法設定を防止する携帯電話機用番号割り当てモジュール設定システムを説明している。
410、及びランダム・アクセス・メモリ(RAM)408と連携して動作する。コントローラ400は、マイクロプロセッサ402及び内部読み出し専用メモリ(IROM)403を含む。IROM403は、ブート・コード404、ハッシュ・コード405、認証コード409、及び公開暗号化鍵406を含む。コントローラ400はまた、保護スタティック・ランダム・アクセス・メモリ(PSRAM)407、割り込みコントローラ421、及び選択されたメモリ内容へのマイクロプロセッサ402による周期的ハッシュ計算を開始させるめのハードウェアに基づくタイマ401を含む。EEPROM410は、利用者プロファイル・データ412、ESN414、MIN416、及び署名された/署名されていない有効ハッシュ値対418を含む。セルラ電話の全般動作に係わる命令コードがフラッシュ・プログラム・メモリ420に含まれる。RAMメモリ408は、正規セルラ電話呼処理の部分である動作のためのスクラッチパッドとして使用される。感応性データ、ハッシュ値計算及び認証プロセスに係わる動作は、好適には、PSRAM407と連携して実施される。コントローラ400は、メモリ・バス424を経由して、フラッシュ・プログラム・メモリ420、RAM408、及びEEPROM410と通信する。
任意長入力を取りかつ固定長の出力を生じることができる多くの関数があるが、しかし片方向ハッシュ関数は次の追加特徴を有する。すなわち、Mが与えられると、hを計算するのが容易である。hが与えられても、Mを計算するのが困難である。及び、Mが与えられると、H(M)=H(M')のような他のメッセージM'を見付けるのが困難である。
次いで、暗号化鍵eは、eと(p-1)(q-1) とが相対的に素数であるようにランダムに選択される。最後にユークリッドのアルゴリズムを使用して、復号鍵dが次のように計算される。
ed=1(modF) 式4
数e及びnは公開鍵であり、数dは秘密鍵である。式5がRSA暗号化プロセスを与え、及び式6が復号化プロセスを与える。
M=Cd(modn) 式6
因数nを求める能力のある敵は、式3を使用して係数Fを決定し、次いで、公開鍵eが与えられるならば、式4から秘密鍵dを決定することができるかもしれない。それにもかかわらず、上に注意したように、nは、普通、非常に大きいからこのような因数分解を実行不可能にする。RSAアルゴリズムについての更に詳細は、リヴェスト他の米国特許第4,405,829号に見ることができる。
論理式1 S=↑Supvr・B
論理式2 Halt=notS・(A+C)
S = 安全モード、
↑Supvr= マイクロプロセッサの監視モードへの遷移、
A = PSRAMメモリに対するチップ選択信号、
B = IROMメモリに対するチップ選択信号、
C = ハードウェア・タイマに対するチップ選択信号、
Halt= マイクロプロセッサへのハードウェア制御入力であって、マイクロプロセッサを無際限ループに入れる、又は電源が除かれかつ電話に再印加されるまで待機させる。
Claims (12)
- メモリ・プログラミング能力を有する電子装置への無許可アクセスを防止するシステムであって、
データ転送装置(750)からのアクセス・リクエスト・メッセージに応答してチャレンジ・レスポンス認証プロセスを開始させるマイクロプロセッサ(402)を含み、
前記データ転送装置(750)が、秘密暗号化鍵を使用してチャレンジ応答メッセージを署名する手段と、前記電子装置へ前記署名されたチャレンジ応答メッセージを送信する手段とを含み、
前記電子装置が、前記秘密鍵に対応する公開鍵を使用して前記署名されたチャレンジ応答メッセージを認証する手段と、前記チャレンジ応答メッセージが前記認証によって有効と認定されない場合に前記データ転送装置(750)を拒否する手段とを更に含む、システム。 - 請求項1記載のシステムであって、前記電子装置がセルラー電話である、システム。
- 請求項2記載のシステムであって、
第1ポートと第2ポートとを有する汎用コンピュータをさらに含み、
前記データ転送装置(750)が前記第1ポートへの取り付けられ、
前記セルラー電話が前記第2ポートへの取り付けられ、
前記セルラー電話が、前記データ転送装置(750)から受信した前記セルラー電話をプログラムするリクエストに応答してチャレンジを返す手段を含み、前記チャレンジが前記データ転送装置(750)によって署名され、かつ、認証のために前記セルラ−電話に返され、
前記セルラー電話において、前記署名されたチャレンジの認証により、前記チャレンジが復元されればデータ転送装置(750)は真正であって、前記セルラ−電話はプログラミング・モードに移行する、システム。 - メモリ・プログラミング能力を有する電子装置への無許可アクセスを防止する方法であって、
前記電子装置(400)が、データ転送装置(750)からのアクセス・リクエスト・メッセージに応答してチャレンジメッセージを送信するステップと、
前記データ転送装置(750)が、秘密暗号化鍵を使用して前記データ転送装置(750)内で前記チャレンジメッセージを署名するステップと、
前記データ転送装置(750)が、前記電子装置(400)に前記署名されたチャレンジメッセージを送信するステップと、
前記電子装置(400)が、公開鍵を使用して前記電子装置(400)内で前記署名されたメッセージを認証するステップであって、前記公開鍵が前記秘密暗号化鍵に対応する前記認証するステップと、
前記電子装置(400)が、もし前記チャレンジメッセージが、前記認証するステップにおいて有効と認定されないならば、前記データ転送装置(750)を拒否するステップと、を含む方法。 - 請求項4記載の方法あって、前記電子装置(400)がセルラー電話である、方法。
- 請求項4記載の方法あって、前記署名されたチャレンジメッセーシが前記チャレンジメッセージの部分に依存するチャレンジ応答メッセージであり、
前記方法が、前記電子装置(400)が、前記署名されたチャレンジ応答メッセージが前記データ転送装置(750)が真正であることを示す場合に、認証のプログラミング・モードに移行するステップを更に含む方法。 - データ転送装置(750)による無許可のアクセスを防止するための、プログラミング能力を有する電子装置であって、
前記電子装置への無許可アクセスを防止するマイクロプロセッサ(402)を含み、
前記電子装置が、
前記データ転送装置(750)からの前記電子装置へアクセスするリクエストに応答して、前記データ転送装置(750)へチャレンジメッセージを発行する手段と、
前記データ転送装置(750)が、秘密暗号化鍵を使用して前記チャレンジメッセージを署名して、前記電子装置へ前記署名されたチャレンジメッセージを送信した場合に、前記電子装置において前記秘密鍵に対応する公開鍵を使用して前記署名されたチャレンジメッセージを認証する手段と、
前記チャレンジメッセージが前記認証によって有効と認定されない場合に、前記データ転送装置(750)を拒否する手段と
を更に含む、電子装置。 - 請求項7記載の電子装置あって、前記電子装置がセルラー電話であり、前記データ転送装置(750)がプログラマである、電子装置。
- 電子装置のメモリへの無許可のアクセスを防止するシステムであって、
マイクロプロセッサ(402)と、
命令コードを含む読み出し専用メモリ(403)と、
保護されたランダム・アクセス・メモリ(407)と
前記保護されたランダム・アクセス・メモリ(407)へアクセスする企図を検出し、前記読み出し専用メモリ(403)に記憶された前記命令コードの実行に基づくアクセスを、該アクセスが認証された場合に許可し、かつ、前記アクセスが認証されない場合に、前記マイクロプロセッサ(402)の動作を停止させて、係るアクセスを防止する安全論理(1124)と、
を含むシステム。 - 請求項9記載のシステムであって、ハードウェアに基づくタイマ(401)を更に含み、
前記安全論理(1124)が、前記読み出し専用メモリ(403)に記憶された前記命令コードの実行に基づく前記ハードウェア・ベース・タイマ(401)への認証されたアクセスを許可し、認証されないアクセスを防止する、システム。 - 請求項9記載のシステムにおいて、前記システムが監視モードにある場合にのみ、前記安全論理(1124)が、前記読み出し専用メモリ(403)に記憶された前記命令コードの実行に基づいて前記保護されたランダム・アクセス・メモリ(407)へアクセスする、システム。
- 請求項9記載のシステムであって、セルラー電話におけるメモリアクセスを防止するシステム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/706,574 US6026293A (en) | 1996-09-05 | 1996-09-05 | System for preventing electronic memory tampering |
US08/706,574 | 1996-09-05 |
Related Parent Applications (1)
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JP2007107618A Division JP2007293847A (ja) | 1996-09-05 | 2007-04-16 | 電子メモリ改竄防止システム |
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JP2011238246A true JP2011238246A (ja) | 2011-11-24 |
JP4917681B2 JP4917681B2 (ja) | 2012-04-18 |
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Application Number | Title | Priority Date | Filing Date |
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JP51277098A Expired - Lifetime JP4050322B2 (ja) | 1996-09-05 | 1997-09-05 | 電子メモリ改竄防止システム |
JP2007107618A Pending JP2007293847A (ja) | 1996-09-05 | 2007-04-16 | 電子メモリ改竄防止システム |
JP2007263735A Expired - Lifetime JP4777957B2 (ja) | 1996-09-05 | 2007-10-09 | 電子メモリ改竄防止システム |
JP2011007295A Expired - Lifetime JP4955818B2 (ja) | 1996-09-05 | 2011-01-17 | 電子メモリ改竄防止システム |
JP2011125634A Expired - Lifetime JP4917681B2 (ja) | 1996-09-05 | 2011-06-03 | 電子メモリ改竄防止システム |
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Application Number | Title | Priority Date | Filing Date |
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JP51277098A Expired - Lifetime JP4050322B2 (ja) | 1996-09-05 | 1997-09-05 | 電子メモリ改竄防止システム |
JP2007107618A Pending JP2007293847A (ja) | 1996-09-05 | 2007-04-16 | 電子メモリ改竄防止システム |
JP2007263735A Expired - Lifetime JP4777957B2 (ja) | 1996-09-05 | 2007-10-09 | 電子メモリ改竄防止システム |
JP2011007295A Expired - Lifetime JP4955818B2 (ja) | 1996-09-05 | 2011-01-17 | 電子メモリ改竄防止システム |
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US (1) | US6026293A (ja) |
EP (1) | EP0923842B1 (ja) |
JP (5) | JP4050322B2 (ja) |
KR (1) | KR100492840B1 (ja) |
CN (2) | CN1126398C (ja) |
AU (1) | AU734212B2 (ja) |
BR (1) | BRPI9712007B1 (ja) |
DE (1) | DE69736065T2 (ja) |
EE (1) | EE9900084A (ja) |
ES (1) | ES2262189T3 (ja) |
HK (1) | HK1021104A1 (ja) |
PL (1) | PL332050A1 (ja) |
WO (1) | WO1998010611A2 (ja) |
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GB2328843B (en) * | 1997-08-29 | 2002-08-14 | Nokia Mobile Phones Ltd | A system for remotely accessing data stored in a radiotelephone |
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EP0923842A2 (en) | 1999-06-23 |
CN1446015A (zh) | 2003-10-01 |
JP4917681B2 (ja) | 2012-04-18 |
KR20000068467A (ko) | 2000-11-25 |
HK1021104A1 (en) | 2000-05-26 |
PL332050A1 (en) | 1999-08-16 |
WO1998010611A3 (en) | 1998-07-09 |
DE69736065T2 (de) | 2007-01-04 |
ES2262189T3 (es) | 2006-11-16 |
WO1998010611A2 (en) | 1998-03-12 |
BRPI9712007B1 (pt) | 2017-06-06 |
US6026293A (en) | 2000-02-15 |
EP0923842B1 (en) | 2006-06-07 |
JP2008112443A (ja) | 2008-05-15 |
JP2001500293A (ja) | 2001-01-09 |
CN1126398C (zh) | 2003-10-29 |
JP4050322B2 (ja) | 2008-02-20 |
AU4172297A (en) | 1998-03-26 |
EE9900084A (et) | 1999-10-15 |
CN1235743A (zh) | 1999-11-17 |
JP2007293847A (ja) | 2007-11-08 |
JP4955818B2 (ja) | 2012-06-20 |
JP4777957B2 (ja) | 2011-09-21 |
DE69736065D1 (de) | 2006-07-20 |
JP2011170841A (ja) | 2011-09-01 |
BR9712007A (pt) | 1999-08-24 |
KR100492840B1 (ko) | 2005-06-07 |
AU734212B2 (en) | 2001-06-07 |
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