K
Kazuo Takaragi
Researcher at Hitachi
Publications - 183
Citations - 3587
Kazuo Takaragi is an academic researcher from Hitachi. The author has contributed to research in topics: Key (cryptography) & Digital signature. The author has an hindex of 32, co-authored 181 publications receiving 3584 citations.
Papers
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Patent
Digital data authentication method
Hiroshi Yoshiura,Kazuo Takaragi,Ryoichi Sasaki,Seiichi Susaki,Hisashi Toyoshima,Tsukasa Saito +5 more
TL;DR: In this paper, the authors proposed a method for identifying a purchaser who purchased content from which an illegal copy was produced by using a watermarking scheme to identify the buyer who purchased the content from the source of the illegal copy.
Patent
Electronic document processing system and method of forming digital signature
TL;DR: In this article, when a user changes the contents of the received electronic document, a new digital signature is produced by enciphering signature data by using a secret key of the user, the signature data including a hash total of the document of a new version, personal information of a user (signatory), and version management information necessary to restore an electronic document from the electronic document of the new version.
Patent
Method and a device for managing a computer network
TL;DR: In this paper, a method and a device for managing a computer network, especially a technique for ensuring the security of a network, is presented, in which computers are connected to each other through transmission lines, each computer stores the data which constitutes a moving type software exclusively used for security and transmitted together with a message when the computer transmits the message to another computer of the system, and executes the moved type software by using the stored data upon receiving a message from another computer.
Patent
Automatic trading method and apparatus
TL;DR: In this paper, a method and system for automatically trading of items such as stocks with improved security is provided for automatic trading of stocks such as this paper. But this method requires the trading data to be verified using at least a portion of the confirmation information.
Patent
Method for electronic transaction with digital signature
Kazuo Takaragi,Ryoichi Sasaki +1 more
TL;DR: In this paper, the authors propose a scheme to decode the signatures submitted by transacting parties as evidences by using a public key and checks as the basic of h(M) and the identifiers of the transacts parties whether the evidence data concern the same transaction or not.