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WO1998002989B1 - Cryptographic communication system - Google Patents

Cryptographic communication system

Info

Publication number
WO1998002989B1
WO1998002989B1 PCT/US1997/012612 US9712612W WO9802989B1 WO 1998002989 B1 WO1998002989 B1 WO 1998002989B1 US 9712612 W US9712612 W US 9712612W WO 9802989 B1 WO9802989 B1 WO 9802989B1
Authority
WO
WIPO (PCT)
Prior art keywords
node
encryption
private
data file
encrypting
Prior art date
Application number
PCT/US1997/012612
Other languages
French (fr)
Other versions
WO1998002989A1 (en
Filing date
Publication date
Priority claimed from US08/682,298 external-priority patent/US5812671A/en
Application filed filed Critical
Priority to EP97937992A priority Critical patent/EP0906677A3/en
Publication of WO1998002989A1 publication Critical patent/WO1998002989A1/en
Publication of WO1998002989B1 publication Critical patent/WO1998002989B1/en

Links

Abstract

A cryptographic communications system for communication between a node A and a node B via a secure communications encryption gateway. Node A composes a file to be transferred to node B (50). The file is encrypted (53) at Node A, using Node A's algorithm and key. The encrypted file is sent to the encryption gateway (54). At the encryption gateway, the sender, node A, is identified (56); and the intended recipient, node B, is identified (58). The encrypted file is decrypted using node A's algorithm and key (66), and the decrypted file is re-encrypted using node B's algorithm and key (68). The encryption gateway, then, sends the re-encrypted file to node B. Node B uses its decryption algorithm and key to decrypt the file (74).

Claims

AMENDED CLAIMS[received by the International Bureau on 20 February 1998 (20.02.98); original claims 1-7 replaced by amended claims 1-4 (3 pages)]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.
2. A cryptographic communication method as in claim 1 wherein the step of periodically selecting one of said plurality of nodes is performed on a random basis.
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.
4. A cryptographic communication method as in claim 3 wherein the step of periodically selecting one of said plurality of nodes is performed on a random basis.
PCT/US1997/012612 1996-07-17 1997-07-17 Cryptographic communication system WO1998002989A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97937992A EP0906677A3 (en) 1996-07-17 1997-07-17 Cryptographic communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/682,298 1996-07-17
US08/682,298 US5812671A (en) 1996-07-17 1996-07-17 Cryptographic communication system

Publications (2)

Publication Number Publication Date
WO1998002989A1 WO1998002989A1 (en) 1998-01-22
WO1998002989B1 true WO1998002989B1 (en) 1998-04-02

Family

ID=24739081

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/012612 WO1998002989A1 (en) 1996-07-17 1997-07-17 Cryptographic communication system

Country Status (3)

Country Link
US (1) US5812671A (en)
EP (1) EP0906677A3 (en)
WO (1) WO1998002989A1 (en)

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