US4991209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random local message encryption
Assignee: Grumman Corp
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Filing: 1988-10-17
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Granted: 1991-02-05
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Expires: 2008-10-17
Abstract
Abstract Data transmission to an aircraft is secured by encrypting the data between a remote data source and the aircraft. The encryption is initiated when a random number is coupled to the remote location where it is encoded with the data in accordance with a preselected encryption sequence. The encoded data, after transmission to the aircraft, is decoded in the same sequence so that the original data may be retrieved.
Inventors
- 👤 Melvin Kolbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:25
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/20; H04B5/24; H04B5/26; H04B5/266; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/18502; H04B7/18506; H04L; H04L9/00; H04L9/06; H04L9/065; H04L9/0656; H04L9/0662
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A data encryption system for aircraft comprising: a random number generator located on board the aircraft; coupling means for transmitting the random number out through the aircraft skin to first buffer means in an external portable box; means located in the box for storing fixed data to be encrypted; encoding means located in the box for encoding the data with the random number in a predetermined encryption sequence; second buffer means in the aircraft for storing the encrypted data after secure transmission thereto, back through the aircraft skin, by the coupling means; decoding means in the aircraft for decoding the stored encrypted data in accordance with the encryption sequence; and means in the aircraft for storing the data.
Claim 2
Dependent Claim
118 words
A data encryption system for aircraft comprising: a random number generator located on board the aircraft; coupling means for transmitting the random number out through the aircraft skin to first buffer means in an external portable box; means located in the box for storing fixed data to be encrypted; encoding means located in the box for encoding the data with the random number in a predetermined encryption sequence; second buffer means in the aircraft for storing the encrypted data after secure transmission thereto, back through the aircraft skin, by the coupling means; decoding means in the aircraft for decoding the stored encrypted data in accordance with the encryption sequence; and means in the aircraft for storing the data.
Claim 3
Dependent Claim
50 words
The structure set forth in claim 1 wherein the coupling means comprises: a first unit located entirely within the interior aircraft skin surface; and a second unit detachably mounted to the exterior of the aircraft skin, in alignment with the first unit for coupling bi-directional signal transmission through the skin.
Claim 4
Dependent Claim
18 words
The structure set forth in claim 2 wherein the coupling means comprises first and second inductively coupled units.
Claim 5
Independent Claim
116 words
A method for encrypting data transmission between a portable data box and an aircraft comprising the steps: generating a random number aboard the aircraft; coupling the random number out through the aircraft skin, in the absence of physical connection, for storing the random number in the portable box; storing the data to be encrypted in the portable box; encoding the data with the random number, in the box, in a predetermined encryption sequence; coupling the resulting encrypted data back through the aircraft skin for storage in the aircraft; decoding the stored encrypted data in accordance with the encryption sequence; and storing the decoded data, now identical to the data in the portable box, in the aircraft.
Claim 6
Independent Claim
116 words
A method for encrypting data transmission between a portable data box and an aircraft comprising the steps: generating a random number aboard the aircraft; coupling the random number out through the aircraft skin, in the absence of physical connection, for storing the random number in the portable box; storing the data to be encrypted in the portable box; encoding the data with the random number, in the box, in a predetermined encryption sequence; coupling the resulting encrypted data back through the aircraft skin for storage in the aircraft; decoding the stored encrypted data in accordance with the encryption sequence; and storing the decoded data, now identical to the data in the portable box, in the aircraft.
Claim 7
Dependent Claim
17 words
The method set forth in claim 4 wherein each step of coupling is achieved by inductive coupling.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |