Source: http://www.google.nl/patents/US5812671?hl=nl
Timestamp: 2013-05-22 09:56:41
Document Index: 635097622

Matched Legal Cases: ['art 199019', 'art 1991', 'art 2004', 'art 2006', 'art 200030', 'art 200213', 'art 200210', 'art 2009', 'art 2010', 'art 20052', 'art 2012', 'art 2012', 'art 200923', 'art 20012', 'art 200226']

Patent US5812671 - Cryptographic communication system - Google PatentenZoeken Afbeeldingen Maps Play YouTube Nieuws Gmail Drive Meer » Geavanceerd zoeken naar patenten | Webgeschiedenis | Inloggen Geavanceerd zoeken naar patenten PatentenIn this system parties have network access to a network secure communications gateway which stores the current encryption/decryption algorithms and keys for parties registered with the network secure communications gateway. For party A to send an encrypted message to party B, party A encrypts the message...http://www.google.nl/patents/US5812671?utm_source=gb-gplus-sharePatent US5812671 - Cryptographic communication system PublicatienummerUS5812671 APublicatietypeVerlening Aanvraagnummer08/682,298 Publicatiedatum22 sept 1998 Aanvraagdatum17 juli 1996 Prioriteitsdatum17 juli 1996Ook gepubliceerd alsEP0906677A2EP0906677A3WO1998002989A1 UitvindersJr. Robert C. Ross Oorspronkelijke patenteigenaarXante Corporation Classificatie in de VS713/153380/282713/162 Internationale classificatieH04L29/06 Co�peratieve classificatieH04L63/0464H04L29/06 Europese classificatieH04L 63/04B8H04L 29/06ReferentiesPatentcitaties (5) Verwijzingen naar dit patent (95)Externe linksUSPTO USPTO-toewijzing EspacenetCryptographic communication systemUS 5812671 A Samenvatting In this system parties have network access to a network secure communications gateway which stores the current encryption/decryption algorithms and keys for parties registered with the network secure communications gateway. For party A to send an encrypted message to party B, party A encrypts the message using party A's secret key and encryption algorithm, copies of which are stored at the network gateway Party A sends the encrypted message, addressed to party B, initially to the gateway. The gateway decrypts the message, using party A's secret key and algorithm, and then encrypts the decrypted message using party B's secret key and algorithm. Finally, the gateway forwards the re-encrypted message to party B, where B decodes it using B's secret key and algorithm. The secure communications gateway periodically changes client keys (or algorithms and keys) to provide additional system security.
Having thus described my invention, what I claim as new and desire to secure by Letters Patent is as follows: 1. A cryptographic communication method for transmitting encrypted messages over a public network from a sending node to a receiving node, including the steps of: storing at an encryption gateway node a respective different private sending node decryption key and a respective different private receiving node encryption key for each of a plurality of nodes connected to said network; first encrypting at said sending node a data file using a private sending node encryption key; transmitting said data file encrypted in the first encrypting step over said network to an encryption gateway node; first decrypting said data file at said encryption gateway node using a private sending node decryption key corresponding to the private sending node encryption key used in the first encrypting step; second encrypting at said encryption gateway said data file which has been decrypted in the first decrypting step using a private receiving node encryption key for said receiving node; transmitting said data file encrypted in the second encrypting step over said network to said receiving node; second decrypting said data file at said receiving node using a decryption key corresponding to the private receiving node encryption key used in the second encrypting step; periodically selecting one of said plurality of nodes connected to said network, generating a new encryption/decryption key for said one of said plurality of nodes, encrypting said new encryption/decryption key with an encryption/decryption key previously used by said one of said plurality of nodes, transmitting said new encryption/decryption key to said selected one of said plurality of nodes, and storing said new encryption/decryption key at said encryption gateway node.
3. A cryptographic communication method for transmitting encrypted messages over a public network from a sending node to a receiving node, including the steps of: storing at an encryption gateway node a respective different private sending node decryption key and a respective different private receiving node encryption key for each of a plurality of nodes connected to said network; first encrypting at said sending node a data file using a private sending node encryption key; transmitting said data file encrypted in the first encrypting step over said network to an encryption gateway node; first decrypting said data file at said encryption gateway node using a private sending node decryption key corresponding to the private sending node encryption key used in the first encrypting step; second encrypting at said encryption gateway said data file which has been decrypted in the first decrypting step using a private receiving node encryption key for said receiving node; transmitting said data file encrypted in the second encrypting step over said network to said receiving node; second decrypting said data file at said receiving node using a decryption key corresponding to the private receiving node encryption key used in the second encrypting step; periodically selecting one of said plurality of nodes connected to said network, generating a new encryption/decryption algorithm for said one of said plurality of nodes, encrypting said new encryption/decryption algorithm with an encryption/decryption algorithm previously used by said one of said plurality of nodes, transmitting said new encryption/decryption algorithm to said selected one of said plurality of nodes, and storing said new encryption/decryption algorithm at said encryption gateway node.
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