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Proceedings Article•DOI•

New digital multisignature scheme in electronic contract systems

17 Sep 1995-pp 486
TL;DR: Risks are analyzed and a new digital multisignature scheme suitable for contract systems is proposed and the efficiency of the scheme is discussed.
Abstract: The electronic contract system needs to replace hand written signatures with digital signatures, digital multisignature might also be needed in such environments where several persons might sign the same digital message This paper analyzes risks and presents the requirements of a digital multisignature scheme in electronic contract systems A new digital multisignature scheme suitable for contract systems is proposed and the efficiency of the scheme is discussed
Citations
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Patent•
19 Jan 1999
TL;DR: In this article, the authors present a computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information libraries programs to a client computer system and a mobile digital information playback device removably connectable to the client computer systems.
Abstract: A computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information library programs to a client computer system and a mobile digital information playback device removably connectable to the client computer system. The present invention is a computer network based library and information delivery system for accessing and obtaining selected digital information files. The library and information delivery system comprises: 1) a library server having a plurality of digital information files; 2) a client computer system coupled to the library server over a network; and 3) a mobile device removably connectable to the client computer system, the client computer system including logic for requesting a download of a selected one or more of the digital information files from the library server, the client computer system further including logic for downloading the selected one or more of the digital information files to the mobile device.

780 citations

Patent•
12 Sep 1997
TL;DR: In this article, a computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information libraries programs to a client computer system (214) and a mobile digital information playback device (212) is presented.
Abstract: A computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information library programs to a client computer system (214) and a mobile digital information playback device (212) removably connectable to the client computer system. The present invention is a computer network based library and information delivery system for accessing and obtaining selected digital information files. The library and information delivery system comprises: 1) a library server (260) having a plurality of digital information files; 2) a client computer system (214) coupled to the library server (260) over a network (240); and 3) a mobile device (212) removably connectable to the client computer system (214), the client computer system (214) including logic for requesting a download of a selected one or more of the digital information files from the library server (260), the client computer system (214) further including logic for downloading the selected one or more of the digital information files to the mobile device (212).

106 citations

Patent•
06 Apr 1999
TL;DR: In this article, the authors proposed a method and apparatus for personalized time-shifted programming, where the user can designate portions of a playback time provided by the playback device (125) to various selections.
Abstract: A method and apparatus for personalized time-shifted programming. Digital content is retrieved, for example, from a digital library (110). Once retrieved, the content is stored locally, for example, on a personal computer (120). The locally stored content is transferred, in whole or in part, to a playback device (125) that allows a user to listen to the content of the playback device. In one embodiment, the user may designate portions of a playback time provided by the playback device (125) to various selections. For example, with a playback device that provides two hours of content, a user may wish to listen to one half hour of news, one half hour of a series and one hour of an book. Thus, the user may partition one quarter of playback time to each of news and the series and one half of the playback time to the book. In one embodiment, the present invention provides different automatic update techniques for the playback device (125) that may be selected by the user based on how the content is to be used. For example, the news portion may be one half hour of the most recent news available from a particular source. The series may be the most recent episode in the series, whether or not the user has listened to other stored episodes. The book portion may provide one hour of the book from the most recent stopping place each time the playback device (125) is coupled to the library retrieval device (120).

75 citations

Patent•
28 Dec 1998
TL;DR: In this paper, a method and apparatus for digital content license management is disclosed that provides one or more license management devices that manage licenses for playback of digital content, where the license is also included in digital content that the license authorizes for playback.
Abstract: A method and apparatus for digital content license management is disclosed that provides one or more license management devices that manage licenses for playback of digital content. The license management devices create licenses having an associated cardinality that determines the number of playback devices that can be authorized by the license. The license is stored in a set of playback devices, where the number of playback devices in the set corresponds to the cardinality of the license. The license is also included in digital content that the license authorizes for playback. Playback devices that have a license that matches a license included in the digital content are authorized to play the digital content. A single license can be used to provide authorization to play digital content from multiple sources and/or multiple types of content. Playback devices can store multiple licenses, which allows playback devices to belong to multiple sets of playback devices authorized to playback various digital content. In one embodiment digital content files can contain multiple licenses to allow the content files to be shared by multiple sets of playback devices.

44 citations

Patent•
Christopher B. Berryman1, Maieta Howze1, Thomas Kwok1, Mary Jo Mcmillin1, Thao N. Nguyen1 •
12 Jan 2006
TL;DR: In this paper, the signature information is added to a signature data field template corresponding to the electronic document, converted to an image file, and superimposing the image file over the electronic documents to produce a signed electronic document.
Abstract: In one embodiment, the present invention is a method and apparatus for adding signature information to electronic documents. One embodiment of the inventive method involves adding the signature information into a signature data field template corresponding to the electronic document, converting the signature data field template, including the added signature information, to an image file, and superimposing the image file over the electronic document to produce a signed electronic document. The inventive method substantially eliminates the potential for human error and security breaches in the signing of electronic documents.

44 citations

References
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Book Chapter•DOI•
01 Jan 1987
TL;DR: Simple identification and signature schemes which enable any user to prove his identity and the authenticity of his messages to any other user without shared or public keys are described.
Abstract: In this paper we describe simple identification and signature schemes which enable any user to prove his identity and the authenticity of his messages to any other user without shared or public keys. The schemes are provably secure against any known or chosen message attack if factoring is difficult, and typical implementations require only 1% to 4% of the number of modular multiplications required by the RSA scheme. Due to their simplicity, security and speed, these schemes are ideally suited for microprocessor-based devices such as smart cards, personal computers, and remote control systems.

4,193 citations

Proceedings Article•
01 Jan 1994
TL;DR: A sequential and a simultaneous digital multisignature scheme based on the Fiat- Shamir scheme are proposed and are more efficient than the RSA based schemes in the processing speed and the Ohta and Okamoto's scheme in the communication complexity.
Abstract: In this paper we propose a sequential and a simultaneous digital multisignature scheme based on the Fiat- Shamir scheme and discuss the efficiency and security of our schemes. The proposed multisignature schemes overcome the communication complexity problem that arises in the Ohta and Okamoto scheme, and the sequential multisignature scheme enables any intermediate signer to verify the previous multisignature. Our schemes are more efficient than the RSA based schemes in the processing speed and the Ohta and Okamoto's scheme in the communication complexity, and are as secure as the Fiat - Shamir scheme. High efficiency makes themselves attractive alternatives for electronic approval systems in the paperless electronic offices.

1 citations