US5638448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Network with secure communications sessions
Assignee: Individual
•
Filing: 1996-01-11
•
Granted: 1997-06-10
•
Expires: 2016-01-11
Abstract
Abstract A system which uses three way password authentication, and s3DES to encrypt different portions of a logon packet with different keys based on the nature of the communications link. Nodes attached to a particular LAN can have one level of security for data transfer within the LAN while data transfers between LANs on a private network can have a second level of security and LANs connected via public networks can have a third level of security. The level of security can optionally be selected by the user. Data transfers between nodes of a network are kept in separate queues to reduce queue search times and enhance performance. Each session maintains its own key dependent s3DES S-boxes to enhance security.
Inventors
- 👤 Minhtam C. Nguyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:25
CPC Classifications
H; H04; H04L; H04L63/00; H04L63/04; H04L63/0428; H04L63/0435; H04L63/08; H04L63/083; H04L63/10; H04L63/105
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
187 words
A method of securely transmitting packet data between a client and a server with packets encrypted by S-box data, including the steps of: using at least one communication channel to transmit packets between at least one client and a server; encrypting in the client a first logon packet including information identifying the client source system and transmitting the first logon packet to the server; decrypting the first logon packet in the server; encrypting a second logon packet in the server with client authenticating information and transmitting the second logon packet to the client; decrypting the second logon packet in the client; encrypting in the client a third logon packet with session information and transmitting the second logon packet to the server; decrypting the third logon packet in the server; encrypting a fourth logon packet in the server with session information and transmitting the fourth logon packet to the client; and decrypting the fourth logon packet in the client; transmitting encrypted data packets between the client and server which are encrypted using S-box encryption; whereby the client and server can establish secure communications by bi-directionally transmitting encrypted data.
Claim 2
Independent Claim
187 words
A method of securely transmitting packet data between a client and a server with packets encrypted by S-box data, including the steps of: using at least one communication channel to transmit packets between at least one client and a server; encrypting in the client a first logon packet including information identifying the client source system and transmitting the first logon packet to the server; decrypting the first logon packet in the server; encrypting a second logon packet in the server with client authenticating information and transmitting the second logon packet to the client; decrypting the second logon packet in the client; encrypting in the client a third logon packet with session information and transmitting the second logon packet to the server; decrypting the third logon packet in the server; encrypting a fourth logon packet in the server with session information and transmitting the fourth logon packet to the client; and decrypting the fourth logon packet in the client; transmitting encrypted data packets between the client and server which are encrypted using S-box encryption; whereby the client and server can establish secure communications by bi-directionally transmitting encrypted data.
Claim 3
Dependent Claim
29 words
A method, as in claim 1, wherein a plurality of clients are communicating with the server and each client's data packets are encrypted with a different S-box table data.
Claim 4
Dependent Claim
25 words
A method, as in claim 2, wherein a new S-box is selected for a client each time the client establishes a connection with the server.
Claim 5
Dependent Claim
25 words
A method, as in claim 3, including the further steps of: storing the S-box encryption table data in updatable storage; selectively altering the S-box data.
Claim 6
Dependent Claim
35 words
A method as in claim 3, including the further steps of: using the S-box table in updatable storage to encrypt data; selectively altering the S-box data with a key chosen by both client and server.
Claim 7
Dependent Claim
25 words
A method, as in claim 1, including the further steps of: storing the S-box encryption table data in updatable storage; selectively altering the S-box data.
Claim 8
Dependent Claim
73 words
A method, as in claim 1, including the further steps of: using at least two selectable encryption schemes, including at least a first encryption scheme for a first security level and at least a second encryption scheme for a second security level; and the server determines if the security level requested by a client is authorized and if the security level is unauthorized, the server reduces the security level to a permissible level.
Claim 9
Dependent Claim
35 words
A method, as in claim 7, including the further steps of: using the S-box table in updatable storage to encrypt data; selectively altering the S-box data with a key chosen by both client and server.
Claim 10
Dependent Claim
26 words
A method, as in claim 7, wherein a plurality of clients are communicating with the server and each client's data packets are encrypted with different S-boxes.
Claim 11
Dependent Claim
33 words
A method, as in claim 9, wherein a new S-box is selected for a communication session by both the client and the server each time the client establishes a connection with the server.
Claim 12
Dependent Claim
25 words
A method, as in claim 10, including the further steps of: storing the S-box encryption table data in updatable storage; selectively altering the S-box data.
Claim 13
Dependent Claim
35 words
A method, as in claim 10, including the further steps of: using the S-box table in updatable storage to encrypt data; selectively altering the S-box data with a key chosen by both client and server.
Claim 14
Dependent Claim
21 words
A method, as in claim 9, wherein data packets from multiple clients are sent to the server in a single transmission.
Claim 15
Dependent Claim
36 words
A method, as in claim 13, wherein a new s 3 DES S-box is selected for a communication session by both the client and the server each time the client establishes a connection with the server.
Claim 16
Dependent Claim
35 words
A method, as in claim 14, wherein succeeding data packets from a client are continuously sent to the server via a write thread and responses from the server are continuously received via a read thread.
Claim 17
Dependent Claim
35 words
A method, as in claim 15, including the further steps of: using the S-box table in updatable storage to encrypt data; selectively altering the S-box data with a key chosen by both client and server.
Claim 18
Dependent Claim
35 words
A method, as in claim 9, wherein succeeding data packets from a client are continuously sent to the server via a write thread and responses from the server are continuously received via a read thread.
Claim 19
Dependent Claim
25 words
A method, as in claim 17, including the further steps of: storing the S-box encryption table data in updatable storage; selectively altering the S-box data.
Claim 20
Dependent Claim
35 words
A method, as in claim 17, including the further steps of: using the S-box table in updatable storage to encrypt data; selectively altering the S-box data with a key chosen by both client and server.
Claim 21
Dependent Claim
35 words
A method, as in claim 1, including the further steps of: using the S-box table in updatable storage to encrypt data; selectively altering the S-box data with a key chosen by both client and server.
References Cited (Backward Citations)
US4227253A
Cited
US5261070A
Cited
US5136716A
Cited
US5060263A
Cited
US5375207A
Cited
US5073852A
Cited
US5142622A
Cited
US5226172A
Cited
US5263165A
Cited
US5220655A
Cited
US5323146A
Cited
US5111504A
Cited
US5239648A
Cited
US5241599A
Cited
US5392357A
Cited
US5418854A
Cited
US5311593A
Cited
US5268962A
Cited
US5301247A
Cited
US5349642A
Cited
US5369707A
Cited
US5559883A
Cited
US5416842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |