JP2012199721A - 署名装置、署名方法、および署名プログラム - Google Patents
署名装置、署名方法、および署名プログラム Download PDFInfo
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- JP2012199721A JP2012199721A JP2011061788A JP2011061788A JP2012199721A JP 2012199721 A JP2012199721 A JP 2012199721A JP 2011061788 A JP2011061788 A JP 2011061788A JP 2011061788 A JP2011061788 A JP 2011061788A JP 2012199721 A JP2012199721 A JP 2012199721A
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- G—PHYSICS
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- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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- G06V20/46—Extracting features or characteristics from the video content, e.g. video fingerprints, representative shots or key frames
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- G—PHYSICS
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- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
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Abstract
【解決手段】署名装置が含まれる署名システム100は、動画情報101内の各フレームに対する静止画像情報をそれぞれ生成する。また、生成時に、署名システム100は、静止画像情報を格納する静止画像情報ファイルに、動画情報101のIDとフレーム番号を含んだメタ情報を画像フォーマットに従った拡張領域に書き込む。書き込み後、署名システム100は、メタ情報が書き込まれた静止画像情報ファイルからダイジェスト情報を生成する。続けて、署名システム100は、静止画像情報ファイル1ダイジェスト情報、静止画像情報ファイル2ダイジェスト情報、静止画像情報ファイル3ダイジェスト情報、をフレーム番号順に記憶し、署名対象102として電子署名103を付与する。
【選択図】図1
Description
図4は、署名装置205のハードウェア例を示すブロック図である。図4において、署名装置205は、CPU(Central Processing Unit)401と、ROM(Read‐Only Memory)402と、RAM(Random Access Memory)403と、を含む。また、記憶装置として署名装置205は、磁気ディスクドライブ404と、磁気ディスク405と、光ディスクドライブ406と、光ディスク407と、を含む。また、署名装置205は、I/F(Interface)408を含む。また、各部はバス409によってそれぞれ接続されている。
次に、署名生成部504と画像抽出部505と署名検証部506の機能例について説明する。図6は、署名生成部504/画像抽出部505/署名検証部506の機能例を示すブロック図である。なお、署名生成部504と、画像抽出部505は、一部共通した機能を有するためあわせて説明を行う。
601 入力部
602 動画復号部
603 転送部
604 変換部
605 静止画符号化部
606 原本メタ情報抽出部
607 暗号化部
608 書込部
609 指定部
610 切り出しメタ情報生成部
611 ダイジェスト情報生成部
612 電子署名生成部
613 電子署名検証部
621 入力部
622 電子署名検証部
623 メタ情報抽出部
624 復号部
625 検索部
626 ダイジェスト情報生成部
627 判定部
628 出力部
630 記憶部
Claims (9)
- 動画像データを構成する複数の画像データの各々について、前記画像データの位置情報と前記動画像データの識別情報とを含む原本メタ情報を画像データごとに前記動画像データから抽出する抽出手段と、
前記画像データごとに、前記画像データを画像フォーマットに従って静止画像データに符号化し、前記静止画像データを格納する静止画像データファイルの格納領域のうち、前記静止画像データを第1の領域に書き込み、前記抽出手段によって抽出された前記原本メタ情報を第2の領域に書き込む書込手段と、
前記書込手段による書き込み後の静止画像データファイルに対して要約情報を生成するダイジェスト情報生成手段と、
を備えることを特徴とする署名装置。 - 識別情報が設定された利用者による前記複数の画像データのうちいずれかの画像データの位置情報の指定を基に、画像データ位置情報を指定する指定手段と、
前記指定手段によって指定された位置情報が指定された時刻と前記指定手段により位置情報を指定した利用者の識別情報とを含む切り出しメタ情報を生成する切り出しメタ情報生成手段と、をさらに備え、
前記書込手段は、
前記切り出しメタ情報生成手段によって生成された切り出しメタ情報を前記静止画像データファイルの第3の領域に書き込み、
前記ダイジェスト情報生成手段は、
前記書込手段による書き込み後の静止画像データファイルに対して要約情報を生成する
ことを特徴とする請求項1に記載の署名装置。 - 前記ダイジェスト情報生成手段は、
前記書込手段による書き込み後の静止画像データファイルと自装置の固有情報との組合せに対して新たな要約情報を生成し、
前記書込手段は、
前記新たな要約情報を前記静止画像データファイルの第4の領域に書き込む
ことを特徴とする請求項2に記載の署名装置。 - 前記ダイジェスト情報生成手段は、
前記いずれかの画像情報の原本メタ情報と前記切り出しメタ情報と自装置の固有情報との組合せに対して新たな要約情報を生成し、
前記書込手段は、
前記新たな要約情報を前記静止画像データファイルの第4の領域に書き込む
ことを特徴とする請求項2に記載の署名装置。 - 動画像データを記憶するとともに、画像フォーマットに従って画像データから符号化された静止画像データの格納先となる第1の領域と前記画像データの前記動画像データ内での位置情報および前記動画像データの識別情報の格納先となる第2の領域とを含む静止画像データファイルの各々の要約情報を、前記動画像データ内での各画像データの位置情報に関連付けて記憶する記憶手段と、
検証対象の静止画像データファイルの中の前記第2の領域に格納された情報を抽出する抽出手段と、
前記記憶手段に記憶されている要約情報群の中から、前記動画像データの識別情報および前記画像データの位置情報の組合せが前記抽出手段によって抽出された情報に該当する要約情報を検索する検索手段と、
前記検証対象の静止画像データファイルに対して要約情報を生成するダイジェスト情報生成手段と、
前記検索手段によって検索された要約情報と前記ダイジェスト情報生成手段によって生成された要約情報とが一致しているか否かを判定する判定手段と、
前記判定手段によって判定された判定結果を出力する出力手段と、
を備えることを特徴とする署名装置。 - コンピュータが、
動画像データを構成する複数の画像データの各々について、前記画像データの位置情報と前記動画像データの識別情報とを含む原本メタ情報を画像データごとに前記動画像データから抽出し、
前記画像データごとに、前記画像データを画像フォーマットに従って静止画像データに符号化し、前記静止画像データを格納する静止画像データファイルの格納領域のうち、前記静止画像データを第1の領域に書き込み、抽出された前記原本メタ情報を第2の領域に書き込み、
書き込み後の静止画像データファイルに対して要約情報を生成する、
処理を実行する署名方法。 - 動画像データを記憶するとともに、画像フォーマットに従って画像データから符号化された静止画像データの格納先となる第1の領域と前記画像データの前記動画像データ内での位置情報および前記動画像データの識別情報の格納先となる第2の領域とを含む静止画像データファイルの各々の要約情報を、前記動画像データ内での各画像データの位置情報に関連付けて記憶するコンピュータが、
検証対象の静止画像データファイルの中の前記第2の領域に格納された情報を抽出し、
記憶されている要約情報群の中から、前記動画像データの識別情報および前記画像データの位置情報の組合せが抽出された前記情報に該当する要約情報を検索し、
前記検証対象の静止画像データファイルに対して要約情報を生成し、
検索された要約情報と生成された要約情報とが一致しているか否かを判定し、
判定された判定結果を出力する、
処理を実行する署名方法。 - コンピュータに、
動画像データを構成する複数の画像データの各々について、前記画像データの位置情報と前記動画像データの識別情報とを含む原本メタ情報を画像データごとに前記動画像データから抽出し、
前記画像データごとに、前記画像データを画像フォーマットに従って静止画像データに符号化し、前記静止画像データを格納する静止画像データファイルの格納領域のうち、前記静止画像データを第1の領域に書き込み、抽出された前記原本メタ情報を第2の領域に書き込み、
書き込み後の静止画像データファイルに対して要約情報を生成する、
処理を実行させる署名プログラム。 - 動画像データを記憶するとともに、画像フォーマットに従って画像データから符号化された静止画像データの格納先となる第1の領域と前記画像データの前記動画像データ内での位置情報および前記動画像データの識別情報の格納先となる第2の領域とを含む静止画像データファイルの各々の要約情報を、前記動画像データ内での各画像データの位置情報に関連付けて記憶するコンピュータに、
検証対象の静止画像データファイルの中の前記第2の領域に格納された情報を抽出し、
記憶されている要約情報群の中から、前記動画像データの識別情報および前記画像データの位置情報の組合せが抽出された前記情報に該当する要約情報を検索し、
前記検証対象の静止画像データファイルに対して要約情報を生成し、
検索された要約情報と生成された要約情報とが一致しているか否かを判定し、
判定された判定結果を出力する、
処理を実行させる署名プログラム。
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US20120237180A1 (en) | 2012-09-20 |
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