Patent US6240113B1 successfully refreshed from Google Patents.
US5208859A
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Method for rekeying secure communication units by group
Assignee: Motorola Solutions Inc
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Filing: 1991-03-15
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Granted: 1993-05-04
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Expires: 2011-03-15
Abstract
Abstract A method for storing and managing rekeying information for a secure communication system, as well as for carrying out a rekeying operation. Encryption key variables stored in memory (301) are represented by mnemonics (303) as part of an editable data base (302) that is arranged in the same order as communication unit key storage locations. Each communication unit (305) within the system is assigned to a specific group (304), while each group (304) is assigned to a particular editable data base (302).
Inventors
- 👤 John T. Bartucci
- 👤 Kevin M. Cutts
- 👤 Jeffrey J. Brzozowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/08; H04L9/0891; H04L9/0816; H04L9/0819; H04L9/083; H04L9/0833; H04L9/0894
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
In a secure communication system including a plurality of communication units and a key management controller, a method for storing and managing rekeying information, the method comprising: (a) storing communication unit identification information within the key management controller; (b) storing encryption keys associated with the communication units within the key management controller; (c) maintaining a plurality of editable data bases that establish a one-to-one correspondence between the encryption keys and key storage locations within the communication units; (d) assigning each communication unit to one of a number of predetermined groups; and (e) assigning each group to one of the editable data bases.
Claim 2
Dependent Claim
102 words
In a secure communication system including a plurality of communication units and a key management controller, a method for storing and managing rekeying information, the method comprising: (a) storing communication unit identification information within the key management controller; (b) storing encryption keys associated with the communication units within the key management controller; (c) maintaining a plurality of editable data bases that establish a one-to-one correspondence between the encryption keys and key storage locations within the communication units; (d) assigning each communication unit to one of a number of predetermined groups; and (e) assigning each group to one of the editable data bases.
Claim 3
Dependent Claim
21 words
The method in accordance with claim 1, wherein each of said editable data bases in an arrangement of encryption key mnemonics.
Claim 4
Dependent Claim
26 words
The method in accordance with claim 1, wherein the number of predetermined groups is approximately equal to the square root of the number of communication units.
Claim 5
Dependent Claim
131 words
In a secure communication system including a plurality of communication units and a key management controller, a method for rekeying the communication units, the method comprising: (a) storing communication unit identification information with the key management controller; (b) storing encryption keys associated with the communication units within the key management controller; (c) maintaining a plurality of editable data bases that establish a one-to-one correspondence between the encryption keys and key storage locations within the communication units; (d) assigning each communication unit to one of a number of predetermined groups; (e) assigning each group to one of the editable data bases; and (f) transmitting new encryption keys to the communication units within each predetermined group by extracting the encryption keys from the editable data base to which each group has been assigned.
Claim 6
Dependent Claim
131 words
In a secure communication system including a plurality of communication units and a key management controller, a method for rekeying the communication units, the method comprising: (a) storing communication unit identification information with the key management controller; (b) storing encryption keys associated with the communication units within the key management controller; (c) maintaining a plurality of editable data bases that establish a one-to-one correspondence between the encryption keys and key storage locations within the communication units; (d) assigning each communication unit to one of a number of predetermined groups; (e) assigning each group to one of the editable data bases; and (f) transmitting new encryption keys to the communication units within each predetermined group by extracting the encryption keys from the editable data base to which each group has been assigned.
Claim 7
Dependent Claim
136 words
For a secure communication system including a plurality of communication units and a key management controller, an apparatus for rekeying the communication units, the apparatus comprising: means for storing communication unit identification information within the key management controller; means for storing encryption keys associated with the communication units within the key management controller; means for maintaining a plurality of editable data bases that establish a one-to-one correspondence between the encryption keys and key storage locations within the communication units; means for assigning each communication unit to one of a number of predetermined groups; means for assigning each group to one of the editable data bases; means for transmitting new encryption keys to the communication units within each predetermined group by extracting the encryption keys from the editable data base to which each group has been assigned.
Claim 8
Dependent Claim
136 words
For a secure communication system including a plurality of communication units and a key management controller, an apparatus for rekeying the communication units, the apparatus comprising: means for storing communication unit identification information within the key management controller; means for storing encryption keys associated with the communication units within the key management controller; means for maintaining a plurality of editable data bases that establish a one-to-one correspondence between the encryption keys and key storage locations within the communication units; means for assigning each communication unit to one of a number of predetermined groups; means for assigning each group to one of the editable data bases; means for transmitting new encryption keys to the communication units within each predetermined group by extracting the encryption keys from the editable data base to which each group has been assigned.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |