Patent
Cryptographic communication method and system
Kazuo Takaragi,Yasuhiro Ishii,Nakamura Tsutomu +2 more
- 21 Feb 1991
74
TL;DR: A cryptographic communication method and system for performing cryptographic communication between a host computer and a given one of plural terminals connected to the host computer by way of a communication network by using a data key designated by the given terminal or the host as mentioned in this paper.
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Abstract: A cryptographic communication method and system for performing cryptographic communication between a host computer and a given one of plural terminals connected to the host computer by way of a communication network by using a data key designated by the given terminal or the host, wherein the host computer includes a cryptographic processing unit which includes a processing part for performing a public key cryptographic processing by using a pair of a public key and a private key and a common key cryptographic processing by using a common key, and an internal memory for storing master common key and master private key, a storage for recording as user private key information those data that result from the public key cryptographic processing performed by using a master public key on a plurality of user private keys which are in paired relation to user public keys held in the user terminals, respectively, and control means for performing input/output control between the storage and the cryptographic processing means.
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Citations
Patent
Media content protection utilizing public key cryptography
Robert J Sims
- 30 Mar 1999
TL;DR: In this article, a system and method for providing protection of content stored on a bulk storage media is described, and a technique for protecting from unauthorized utilization of the content stored is provided publicly in order to allow for those utilizing a conforming media device to master or generate content protected according to the present invention.
501
Patent
Tamper resistant methods and apparatus
Joseph M. Nardone,Richard P. Mangold,Jody L. Pfotenhauer,Keith L. Shippy,David W. Aucsmith,Richard L. Maliszewski,Gary L. Graunke +6 more
- 12 Jun 1997
TL;DR: In this article, the authors present a tamper resistant decryption scheme using obfuscation and interlocking trust mechanism, where the pseudo-randomly selected pattern(s) of mutations is unique for each installation.
338
Patent
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Walter Clark Milliken,William Timothy Strayer,Stephen Douglas Milligan +2 more
- 09 Oct 2008
TL;DR: In this article, a system (120) detects transmission of potentially unwanted e-mail messages by generating hash values based on one or more portions of the e-mails and then determining whether the generated hash values match hash values associated with prior e-email messages.
300
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Method of protecting electronically published materials using cryptographic protocols
Abhijit K. Choudhury,Nicholas F. Maxemchuk,Sanjoy Paul,Henning Schulzrinne +3 more
- 27 Jan 1994
TL;DR: In this paper, the authors present a method of protecting electronically published documents, which involves operating a computer system and network for electronic publication of documents, including the steps of: a) receiving requests for documents from a plurality of users (117) having computers with display devices (121) or printers (123), including with the requests unique user identification for each of the plurality's users; b) authenticating the requests from the pluralityof users with a copyright server (7); c) using the copyright server to direct a document server (3) to act upon proper authentication of each request
289
Patent
System and method for data recovery
Steven B. Lipner,David M. Balenson,Carl M. Ellison,Stephen T. Walker +3 more
- 21 Feb 1995
TL;DR: In this paper, a system and method for data escrow cryptography are described, where an encrypting user encrypts a message using a secret storage key (KS) and attaches a data recovery field (DRF), including an access rule index (ARI) and KS, to the encrypted message.
232
References
Patent
Cryptographic method and apparatus for public key exchange with authentication
Kenneth C. Goss
- 05 Jan 1990
TL;DR: In this article, a technique for use in a public key exchange cryptographic system, in which two user devices estab lish a common session key by exchanging information over an insecure communication channel, and in which each user can authenticate the identity of the other, without the need for a key distribution center.
184
Patent
Cryptographic communication security for multiple domain networks
William Friedrich Ehrsam,Robert Carl Elander,Stephen M. Matyas,Carl H. W. Meyer,Robert Lowell Powers,Paul Norman Prentice,John Lynn Smith,Walter Leonard Tuchman +7 more
- 05 Dec 1977
TL;DR: In this paper, a common session key for data transmissions between different domains of a multiple-domain communication network where each domain includes a host system and its associated resources of programs and communication terminals is proposed.
178
Patent
Controlling the use of cryptographic keys via generating station established control values
Stephen M. Matyas,Carl H. W. Meyer,Bruno Brachtl +2 more
- 11 May 1988
TL;DR: In this paper, a method for controlling the use of a cryptographic key at a using station by a generating station in a network of generating and using stations is disclosed, where the key and control value are authenticated via a special authentication code before use by the using station and coupled during key generation such that the key is recovered only if a correct control value is specified.
121
Patent
System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules
Aron Appelbaum,David Bruce Lehman,Donald Joseph Nieglos,Carl Nolte,Michael Peter Oehler +4 more
- 06 Aug 1986
TL;DR: In this article, a system which enables a protected program (e.g., prog. A, prog. B,...) to run only a selected plurality of computers (i.e., computer 10) including a prospective unique key Ki for each computer of the plurality, the key being triple encrypted in the form EFK ADEKi ADEFK ADKi BD BD BD.
67
Patent
Cryptographic communication and file security using terminals
William Friedrich Ehrsam,Robert Carl Elander,Stephen M. Matyas,Carl H. W. Meyer,Robert Lowell Powers,Paul Norman Prentice,John Lynn Smith,Walter Leonard Tuchman +7 more
- 05 Dec 1977
TL;DR: In this paper, the authors present a data security device which includes storage means for storing a master cipher key, cryptographic apparatus for performing cryptographic operations and control means for controlling the writing of a cipher key into the storage means, controlling the transfer of the cipher key to the cryptographic apparatus and controlling the cryptographic equipment to perform cryptographic operations.
46