ELECTRONIC SIGNATURE APPARATUS AND COMPUTER PROGRAM

• Main Authors: YAMAKAWA KAZUO, SUMITO ISAO, TAKAHASHI KAZUMA
• Format: Patent
• Language: English; Japanese
• Published: 18.06.2015
• Subjects: ADVERTISING; CALCULATING; CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY; COMPUTING; COUNTING; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; PHYSICS; SEALS; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To provide an electronic signature apparatus and a computer program capable of performing electronic signature on a record group in a database.SOLUTION: The electronic signature apparatus includes: an access section for accessing a database which stores plural pieces of information while associating with each other; a reception section that receives the selection of a piece of information as a target of electronic signature; an information extraction section that accesses the database and extracts one or plural pieces of information which are stored being associated with the selected information from the database; a calculation section that calculates a unique value which is uniquely determined from the information on the basis of the one or plural pieces of information extracted by the information extraction section; a signature data generation section that generates signature data in which the information selected by the reception section and the unique value calculated by the calculation section are associated with each other; and a storage for storing the generated signature data. 【課題】データベース上のレコード群に対して電子署名を行う電子署名装置及びコンピュータプログラムの提供。【解決手段】複数の情報を関連付けて記憶するデータベースにアクセスするアクセス部と、電子署名の対象とすべき情報の選択を受付ける受付部と、前記データベースにアクセスして、選択された情報と関連付けて記憶されている１又は複数の情報をデータベースから抽出する情報抽出部と、情報抽出部が抽出した１又は複数の情報を基に、該情報から一意に定まる固有値を算出する算出部と、受付部にて選択された情報と算出部にて算出した固有値とを関連付けた署名データを生成する署名データ生成部と、生成した署名データを記憶する記憶部とを備える。【選択図】図３