JP4824352B2 - 外向き通信が特定の内容を含む時を検出する方法およびシステム - Google Patents
外向き通信が特定の内容を含む時を検出する方法およびシステム Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
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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
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6218—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database
- G06F21/6245—Protecting personal data, e.g. for financial or medical purposes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
- G06F16/31—Indexing; Data structures therefor; Storage structures
- G06F16/313—Selection or weighting of terms for indexing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
- G06F16/31—Indexing; Data structures therefor; Storage structures
- G06F16/316—Indexing structures
- G06F16/325—Hash tables
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
- G06F16/33—Querying
- G06F16/3331—Query processing
- G06F16/334—Query execution
- G06F16/3341—Query execution using boolean model
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/21—Monitoring or handling of messages
- H04L51/212—Monitoring or handling of messages using filtering or selective blocking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
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Description
101、102、103 文書ストアデータ構造
111、112、113 「データ構造を初期化する」コンポーネント
121、122、123、124 検出コンポーネント
Claims (18)
- 外向きの通信が秘密情報を含むかどうかを識別するための、コンピュータシステムによって実装される方法であって、
前記コンピュータシステムが、秘密情報を含む複数の秘密文書を受け取るステップと、
前記コンピュータシステムが、当該受け取った秘密文書中の単語に関する重要度を計算して、単語に関して計算された前記重要度が所定のしきい値を超える場合、前記単語をキーワードとして指定するステップと、
前記コンピュータシステムが、前記キーワードを含む前記受け取った秘密文書において前記キーワードの各々をマッピングするキーワードインデックスを生成するステップと、
前記コンピュータシステムが、文を含む前記受け取った秘密文書において前記文のハッシュコードをマッピングする文ハッシュテーブルを生成するステップと、
前記コンピュータシステムが、外向きの通信を受け取るステップと、
前記コンピュータシステムが、前記外向きの通信のキーワードを識別するステップと、
前記コンピュータシステムが、生成したキーワードインデックスを用いて、前記外向きの通信に類似したキーワードを含む第1の秘密文書を識別するステップと、
前記コンピュータシステムが、前記外向きの通信の文に対するハッシュコードを生成するステップと、
前記コンピュータシステムが、生成した文ハッシュテーブルを用いて、識別した第1の秘密文書のうち、前記外向きの通信の文にマッチする文を含む第2の秘密文書を識別するステップと、
前記コンピュータシステムが、該識別した第2の秘密文書の文を前記外向きの通信の文と比較して、前記外向きの通信の文が前記識別した第2の秘密文書の文とマッチするかどうかを判定するステップと、
前記コンピュータシステムが、前記識別した第2の秘密文書の文とマッチする前記外向き通信の文の数に応じて、秘密情報を含むとして前記外向きの通信にフラグを立てるステップと
を備えることを特徴とする方法。
- 前記受け取った秘密文書および前記外向きの通信は、電子メールメッセージであることを特徴とする請求項1に記載の方法。
- 前記コンピュータシステムは、電子メールサーバであることを特徴とする請求項2に記載の方法。
- 受け取った前記外向きの通信が秘密情報を含むと判定したとき、受け取った前記外向きの通信の意図されている受信者への送付を抑制するステップを含むことを特徴とする請求項1に記載の方法。
- 単語をキーワードであるとして識別することを、TF*IDF尺度に基づいて行うことを特徴とする請求項1に記載の方法。
- 前記文ハッシュテーブルは、受け取った秘密文書のキー文にマッピングすることを特徴とする請求項1に記載の方法。
- 探した文が、受け取った前記外向きの通信の文に類似しているとき、受け取った前記外向きの通信は、秘密情報を含むことを特徴とする請求項1に記載の方法。
- 前記外向きの通信は、電子メールメッセージであることを特徴とする請求項1に記載の方法。
- 前記外向きの通信は、電子メールメッセージへの添付であることを特徴とする請求項1に記載の方法。
- 前記外向きの通信は、インスタントメッセージであることを特徴とする請求項1に記載の方法。
- 前記外向きの通信は、音声通信であることを特徴とする請求項1に記載の方法。
- 前記外向きの通信は、インターネットへの投稿であることを特徴とする請求項1に記載の方法。
- 第1の文書がターゲット文書の内容と類似の内容を含むかどうかを識別する方法をコンピュータシステムに実行させるためのコンピュータ実行可能命令を格納したコンピュータ読み取り可能な記録媒体であって、前記方法は、
前記コンピュータシステムが、複数のターゲット文書の表示を受け取るステップと、
前記コンピュータシステムが、当該受け取ったターゲット文書中の単語に関する重要度を計算して、単語に関して計算された前記重要度が所定のしきい値を超える場合、前記単語をキーワードとして指定するステップと、
前記コンピュータシステムが、前記キーワードを含む前記受け取ったターゲット文書において前記キーワードの各々をマッピングするキーワードインデックスを生成するステップと、
前記コンピュータシステムが、文を含む前記受け取ったターゲット文書において前記文のハッシュコードをマッピングする文ハッシュテーブルを生成するステップと、
前記コンピュータシステムが、生成したキーワードインデックスを用いて、前記第1の文書の前記キーワードに類似のキーワードを含む第1のターゲット文書を識別するステップと、
前記コンピュータシステムが、前記第1の文書の文のハッシュコードを生成するステップと、
前記コンピュータシステムが、生成した文ハッシュテーブルを用いて、識別した第1のターゲット文書から、前記第1の文書の文のハッシュコードにマッチするハッシュコードを含む第2のターゲット文書を識別するステップと、
前記コンピュータシステムが、識別した第2のターゲット文書の文と前記第1の文書の文とを比較して、前記第1の文書の文が前記識別した第2のターゲット文書の文とマッチするかどうかを判定するステップと、
該比較が、前記識別した第2のターゲット文書の文の数が前記第1の文書の文の数とマッチすることを示すとき、前記コンピュータシステムが、前記第1の文書が前記識別した第2のターゲット文書の内容と類似する内容を含むことを示すステップと
を備える方法を実行するためのコンピュータ実行可能命令を格納したことを特徴とするコンピュータ読み取り可能な記録媒体。
- 前記複数のターゲット文書および前記第1の文書は、電子メールメッセージであることを特徴とする請求項13に記載のコンピュータ読み取り可能な記録媒体。
- 前記キーワードの識別を、TF*IDF尺度に基づいて行うことを特徴とする請求項13に記載のコンピュータ読み取り可能な記録媒体。
- 前記複数のターゲット文書は、秘密情報を含むことを特徴とする請求項13に記載のコンピュータ読み取り可能な記録媒体。
- 前記第1の文書が秘密情報を含む外向きの通信であるとき、前記コンピュータシステムが、前記外向きの通信の送信を抑制するステップを含むことを特徴とする請求項13に記載のコンピュータ読み取り可能な記録媒体。
- 前記第1の文書及び前記複数のターゲット文書は、電子メールメッセージであり、前記比較するステップにより、関連する電子メールメッセージを見つけることを特徴とする請求項13に記載のコンピュータ読み取り可能な記録媒体。
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/881,867 | 2004-06-30 | ||
US10/881,867 US7594277B2 (en) | 2004-06-30 | 2004-06-30 | Method and system for detecting when an outgoing communication contains certain content |
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JP2006065837A JP2006065837A (ja) | 2006-03-09 |
JP4824352B2 true JP4824352B2 (ja) | 2011-11-30 |
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JP2005184987A Expired - Fee Related JP4824352B2 (ja) | 2004-06-30 | 2005-06-24 | 外向き通信が特定の内容を含む時を検出する方法およびシステム |
Country Status (5)
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US (2) | US7594277B2 (ja) |
EP (1) | EP1613020B1 (ja) |
JP (1) | JP4824352B2 (ja) |
KR (1) | KR101150070B1 (ja) |
CN (1) | CN1716294B (ja) |
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