US5146498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote key manipulations for over-the-air re-keying
Assignee: Motorola Solutions Inc
•
Filing: 1991-01-10
•
Granted: 1992-09-08
•
Expires: 2011-01-10
Abstract
Abstract A method of remotely changing an original voice encryption key in a secure radio (10) is provided which includes a central controller (20) transmitting to the secure radio a digital word (42) representing a selective operation to be performed on the original voice encryption key stored in the radio (10). In response to the digital word (42), the radio (10) performs the operation on the original voice encryption key to generate a current voice encryption key.
Inventors
- 👤 Jeffrey D. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:43
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/08; H04L9/0891; H04L2209/00; H04L2209/80
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
95 words
A method for remotely changing an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing only a selective operation selectable from a plurality of different key operations to be performed on said original voice encryption key alone without changing an encryption polynomial; and performing only said operation on said original voice encryption key alone in said secure radio to generate a current voice encryption key alone in response to said digital word.
Claim 2
Independent Claim
95 words
A method for remotely changing an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing only a selective operation selectable from a plurality of different key operations to be performed on said original voice encryption key alone without changing an encryption polynomial; and performing only said operation on said original voice encryption key alone in said secure radio to generate a current voice encryption key alone in response to said digital word.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said transmitting step comprises transmitting a digital word representing a table entry associated with said selective operation to be performed on said original voice encryption key.
Claim 4
Dependent Claim
32 words
The method of claim 2 further comprising translating by said secure radio to associate said table entry to said selective operation contained in a table of operations stored in said secure radio.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said performing step comprises at least one logical operation.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said performing step comprises shifting right or left said original voice encryption key to generate said current voice encryption key.
Claim 7
Dependent Claim
27 words
The method of claim 1 wherein said performing step comprises exclusively or-ing said current with said original voice encryption key to generate a new voice encryption key.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein said performing step comprises or-ing said current with said original voice encryption key to generate a new voice encryption key.
Claim 9
Dependent Claim
26 words
The method of claim 1 wherein said performing step comprises and-ing said current with said original voice encryption key to generate a new voice encryption key.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein said performing step comprises adding said current to said original voice encryption key to generate a new voice encryption key.
Claim 11
Dependent Claim
30 words
The method of claim 1 wherein said performing step comprises exclusively or-ing said original voice encryption key with a previously stored data word to generate said current voice encryption key.
Claim 12
Dependent Claim
29 words
The method of claim 1 wherein said performing step comprises or-ing said original voice encryption key with a previously stored data word to generate said current voice encryption key.
Claim 13
Dependent Claim
29 words
The method of claim 1 wherein said performing step comprises and-ing said original voice encryption key with a previously stored data word to generate said current voice encryption key.
Claim 14
Dependent Claim
20 words
The method of claim 1 wherein said transmitting step comprises transmitting said digital word including an operation code and data.
Claim 15
Dependent Claim
27 words
The method of claim 13 wherein said performing step comprises exclusively or-ing said data with said original voice encryption key to generate a new voice encryption key.
Claim 16
Dependent Claim
35 words
The method of claim 13 wherein said performing step comprises rotating right or left said original voice encryption key a number of positions as represented by said data to generate said current voice encryption key.
Claim 17
Dependent Claim
26 words
The method of claim 13 wherein said performing step comprises and-ing said data with said original voice encryption key to generate a new voice encryption key.
Claim 18
Independent Claim
95 words
A method of remotely changing an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing a selective operation to be performed on said original voice encryption key; performing said operation on said original voice encryption key in said secure radio to generate a current voice encryption key in response to said digital word, wherein said performing step comprises one's complementing said original voice encryption key to generate said current voice encryption key.
Claim 19
Independent Claim
95 words
A method of remotely changing an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing a selective operation to be performed on said original voice encryption key; performing said operation on said original voice encryption key in said secure radio to generate a current voice encryption key in response to said digital word, wherein said performing step comprises one's complementing said original voice encryption key to generate said current voice encryption key.
Claim 20
Independent Claim
95 words
A method of remotely changing an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing a selective operation to be performed on said original voice encryption key; performing said operation on said original voice encryption key in said secure radio to generate a current voice encryption key in response to said digital word, wherein said performing step comprises two's complementing said original voice encryption key to generate said current voice encryption key.
Claim 21
Independent Claim
95 words
A method of remotely changing an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing a selective operation to be performed on said original voice encryption key; performing said operation on said original voice encryption key in said secure radio to generate a current voice encryption key in response to said digital word, wherein said performing step comprises two's complementing said original voice encryption key to generate said current voice encryption key.
Claim 22
Independent Claim
98 words
A method of remotely changing on an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing a selective operation to be performed on said original voice encryption key; performing said operation on said original voice encryption key in said secure radio to generate a current voice encryption key in response to said digital word, wherein said performing step comprises subtracting said original from said current voice encryption key to generate a new voice encryption key.
Claim 23
Independent Claim
98 words
A method of remotely changing on an original voice encryption key in a secure radio, comprising: storing said original voice encryption key in said secure radio; transmitting by a central controller to said secure radio a digital word representing a selective operation to be performed on said original voice encryption key; performing said operation on said original voice encryption key in said secure radio to generate a current voice encryption key in response to said digital word, wherein said performing step comprises subtracting said original from said current voice encryption key to generate a new voice encryption key.
Claim 24
Dependent Claim
142 words
In a trunked communication system including at least one control unit and plurality of secure subscriber units, a method for remotely changing an original voice encryption key in a secure subscriber unit, comprising: in said secure subscriber unit: storing said original voice encryption key; transmitting to said control unit a key change request; receiving a key change command from said control unit; and performing a selective operation selectable from a plurality of different key operations on said original voice encryption key alone in said secure radio to generate only a current voice encryption key in response to said key change command; and in said control unit: receiving said key change request; and transmitting to said secure subscriber unit said key change command representing only said selective operation to be performed on said original voice encryption key alone without changing an encryption polynomial.
Claim 25
Dependent Claim
142 words
In a trunked communication system including at least one control unit and plurality of secure subscriber units, a method for remotely changing an original voice encryption key in a secure subscriber unit, comprising: in said secure subscriber unit: storing said original voice encryption key; transmitting to said control unit a key change request; receiving a key change command from said control unit; and performing a selective operation selectable from a plurality of different key operations on said original voice encryption key alone in said secure radio to generate only a current voice encryption key in response to said key change command; and in said control unit: receiving said key change request; and transmitting to said secure subscriber unit said key change command representing only said selective operation to be performed on said original voice encryption key alone without changing an encryption polynomial.
References Cited (Backward Citations)
US4440976A
Cited
US4607137A
Cited
US4731840A
Cited
US4882751A
Cited
US4914697A
Cited
US4878246A
Cited
US4993067A
Cited
US4933971A
Cited
US5008938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |