US5872846A
Expired / Lapsed
US
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System and method for providing security in data communication systems
Assignee: Verizon Patent and Licensing Inc
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Filing: 1996-11-07
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Granted: 1999-02-16
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Expires: 2016-11-07
Abstract
Abstract A system and method for providing security in data communication systems where multiple users are coupled to a common receiving system. The data is encrypted or otherwise encoded by a sender using a key. The encrypted data is then scrambled or otherwise encoded, and transmitted by the sender. The transmitted data is received at a receiver where it is descrambled or otherwise decoded. An authorized user decrypts or otherwise decodes the descrambled data using a key to retrieve clear data. The key itself is encrypted by the sender using an asymmetric encryption algorithm, and is then transmitted by the sender. The authorized user decrypts the encrypted key using the asymmetric encryption algorithm, and uses the key to decrypt the encrypted data.
Inventors
- 👤 Bryan K. Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/08; H04L9/0816; H04L9/0819; H04L9/0825; H04L9/083; H04L2209/00; H04L2209/60; H04L2209/601
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
109 words
A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, the method comprising the steps of: encoding said data using a first-level encoding scheme; encoding said first-level encoded data using a second-level encoding scheme; and transmitting said second-level encoded data; wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data.
Claim 2
Independent Claim
109 words
A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, the method comprising the steps of: encoding said data using a first-level encoding scheme; encoding said first-level encoded data using a second-level encoding scheme; and transmitting said second-level encoded data; wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data.
Claim 3
Dependent Claim
19 words
The method according to claim 1 wherein said first-level encoding scheme is an encryption scheme using a first key.
Claim 4
Dependent Claim
32 words
The method according to claim 2 wherein said first-level encoding scheme further comprises: encrypting said first key using the authorized user's public key; and transmitting said encrypted first key to said receiver.
Claim 5
Dependent Claim
37 words
The method according to claim 2 wherein said first-level encoding scheme further comprises: encrypting said first key using the authorized user's said public key and the sender's private key; and transmitting said first key to said receiver.
Claim 6
Dependent Claim
19 words
The method according to claim 1 wherein said second-level encoding scheme comprises scrambling said data using a signal scrambler.
Claim 7
Dependent Claim
41 words
The method according to claim 1 further comprising the steps of: receiving said transmitted data at said receiver; decoding said received data using a second-level decoding scheme; and the authorized user decoding said second-level decoded data using a first-level decoding scheme.
Claim 8
Independent Claim
98 words
A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to said receiver, the method comprising the steps of: receiving said data at said receiver; decoding said data using a second-level decoding scheme wherein said data has been encoded using a second-level encoding scheme by the sender; and the authorized user decoding said data using a first-level decoding scheme wherein the data has been encoded using a first-level encoding scheme by the sender.
Claim 9
Independent Claim
98 words
A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to said receiver, the method comprising the steps of: receiving said data at said receiver; decoding said data using a second-level decoding scheme wherein said data has been encoded using a second-level encoding scheme by the sender; and the authorized user decoding said data using a first-level decoding scheme wherein the data has been encoded using a first-level encoding scheme by the sender.
Claim 10
Dependent Claim
40 words
The method according to claim 7 wherein said first-level decoding scheme further includes: receiving an encrypted first key that has been encrypted and transmitted by the sender; decrypting said first key; and decrypting said data using said decrypted first key.
Claim 11
Dependent Claim
23 words
The method according to claim 8 wherein said encrypted first key is decrypted by the authorized user using the authorized user's private key.
Claim 12
Dependent Claim
29 words
The method according to claim 8 wherein said encrypted first key is decrypted by the authorized user using the authorized user's said private key and the sender's public key.
Claim 13
Dependent Claim
23 words
The method according to claim 7 wherein said second level decoding scheme at the receiver comprises scrambling the data using a signal scrambler.
Claim 14
Independent Claim
127 words
A system for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, comprising: first-level encoder means for encoding said data using a first-level encoding scheme; second-level encoder means, connected to said first-level encoder means, for encoding said first-level encoded data using a second-level encoding scheme; and transmitter means, connected to said second-level encoder means, for transmitting said second-level encoded data; wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data.
Claim 15
Independent Claim
127 words
A system for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, comprising: first-level encoder means for encoding said data using a first-level encoding scheme; second-level encoder means, connected to said first-level encoder means, for encoding said first-level encoded data using a second-level encoding scheme; and transmitter means, connected to said second-level encoder means, for transmitting said second-level encoded data; wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data.
Claim 16
Dependent Claim
21 words
The system according to claim 12 wherein said first-level encoder means is a means for encrypting data using a first key.
Claim 17
Dependent Claim
25 words
The system according to claim 13, wherein said first-level encoder means further comprises means for encrypting said first key using the authorized user's public key.
Claim 18
Dependent Claim
31 words
The system according to claim 13, wherein said first-level encoder means further comprises means for encrypting said first key using the authorized user's said public key and the sender's private key.
Claim 19
Dependent Claim
15 words
The system according to claim 12 wherein said second-level encoder means comprises a signal scrambler.
Claim 20
Dependent Claim
44 words
The system according to claim 12 further comprising: receiver means for receiving said transmitted data; second-level decoder means, connected to said receiver means, for decoding said received data; and first-level decoder means, connected to said second-level decoder means, for decoding said second-level decoded data.
Claim 21
Independent Claim
98 words
An system for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to said receiver, comprising: receiver means for receiving said data; a second-level decoder means, connected to said receiver means, for decoding said data that has been encoded by the sender using a second-level encoder means; and first-level decoder means, connected to said second-level decoder means, for decoding said second-level decoded data that has been encoded by the sender using a first-level encoder means.
Claim 22
Independent Claim
98 words
An system for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to said receiver, comprising: receiver means for receiving said data; a second-level decoder means, connected to said receiver means, for decoding said data that has been encoded by the sender using a second-level encoder means; and first-level decoder means, connected to said second-level decoder means, for decoding said second-level decoded data that has been encoded by the sender using a first-level encoder means.
Claim 23
Dependent Claim
36 words
The system according to claim 18, wherein said first-level decoder means further includes: means for decrypting a first-key that has been encrypted by the sender; and means for decrypting said data using said decrypted first key.
Claim 24
Dependent Claim
20 words
The system according to claim 19 wherein said means for decrypting said first key includes the authorized user's private key.
Claim 25
Dependent Claim
26 words
The system according to claim 19 wherein said means for decrypting said first key includes the authorized user's said private key and the sender's public key.
Claim 26
Dependent Claim
15 words
The system according to claim 18 wherein said second-level decoder means is a signal scrambler.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-02-15 | 2002-08-17 | 2003-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-15 | 2006-08-17 | 2007-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-15 | 2010-08-17 | 2011-02-16 | $7700.00 | Window Closed / Lapsed |