US5161189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encryption and decryption of chained messages
Assignee: Motorola Solutions Inc
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Filing: 1991-03-11
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Granted: 1992-11-03
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Expires: 2011-03-11
Abstract
Abstract A single sync field (501) and multiple messages or message segments (503, 507, 511, and 515) are chained (407) together and encrypted (407) as a whole. When this encrypted chained message is received, it is decrypted as a whole (605), or in part (613) by setting up (609) and filling (611) a holding register with the encryption state of the encrypting device.
Inventors
- 👤 Michelle M. Bray
- 👤 Michael W. Bright
- 👤 Hans C. Sowa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:13
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/12; H04L9/08; H04L9/0816; H04L9/0819; H04L9/083; H04L9/0891; H04L2209/00; H04L2209/80
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
84 words
A method of communication of at least two message segments in an encryption system having an encryption device and a decryption device, comprising the steps of: chaining a data stream and the at least two message segments together into a chained message; encrypting said chained message; transmitting said encrypted chained message to the decryption device; receiving said encrypted chained message at the decryption device; and independently decrypting any segment of said encrypted chained message, without decrypting any other segment of said encrypted chained message.
Claim 2
Independent Claim
84 words
A method of communication of at least two message segments in an encryption system having an encryption device and a decryption device, comprising the steps of: chaining a data stream and the at least two message segments together into a chained message; encrypting said chained message; transmitting said encrypted chained message to the decryption device; receiving said encrypted chained message at the decryption device; and independently decrypting any segment of said encrypted chained message, without decrypting any other segment of said encrypted chained message.
Claim 3
Dependent Claim
68 words
The method of communication of claim 1, said decrypting step further comprising the steps of: determining an encryption state for at least one of the at least two encrypted message segments; and decrypting said at least one of the at least two encrypted message segments by entering said encryption state followed by said at least one of the at least two encrypted message segments into the decryption device.
Claim 4
Dependent Claim
64 words
The method of communication of claim 2, wherein said determining step further comprises the steps of: setting up a holding register for said encryption state; filling said holding register with data from said encrypted chained message received immediately prior to receiving said at least one of the at least two encrypted message segments; and feeding contents of said holding register into the decryption device.
Claim 5
Dependent Claim
45 words
The method of communication of claim 2, said decrypting step further comprising the step of entering message bits, received after reception of said at least one of the at least two encrypted message segments, into the decryption device to recover decryption device throughput delay data.
Claim 6
Dependent Claim
24 words
The method of communication of claim 1, further comprising the step of forming the at least two encrypted message segments from encryption key data.
Claim 7
Dependent Claim
20 words
The method of communication of claim 1, further comprising the step of generating said data stream by randomly selecting bits.
Claim 8
Dependent Claim
30 words
The method of communication of claim 1, said chaining step further comprising the step of placing said data stream and the at least two message segments for transmission in succession.
Claim 9
Dependent Claim
89 words
An encryption system having an encryption device communicating at least two message segments to a decryption device, the encryption system comprising: means for chaining a data stream and the at least two message segments together into a chained message; means for encrypting said chained message; means for transmitting said encrypted chained message to the decryption device; means for receiving said encrypted chained message at the decryption device; and means for independently decrypting any segment of said encrypted chained message, without decrypting any other segment of said encrypted chained message.
Claim 10
Dependent Claim
89 words
An encryption system having an encryption device communicating at least two message segments to a decryption device, the encryption system comprising: means for chaining a data stream and the at least two message segments together into a chained message; means for encrypting said chained message; means for transmitting said encrypted chained message to the decryption device; means for receiving said encrypted chained message at the decryption device; and means for independently decrypting any segment of said encrypted chained message, without decrypting any other segment of said encrypted chained message.
Claim 11
Dependent Claim
69 words
The encryption system of claim 8, said means for decrypting further comprising: means for determining an encryption state for at least one of the at least two encrypted message segments; and means for decrypting said at least one of the at least two encrypted message segments by entering said encryption state followed by said at least one of the at least two encrypted message segments into the decryption device.
Claim 12
Dependent Claim
67 words
The encryption system of claim 9, wherein said means for determining further comprises: means for setting up a holding register for said encryption state; means for filling said holding register with data from said encrypted chained message received immediately prior to receiving said at least one of the at least two encrypted message segments; and means for feeding contents of said holding register into the decryption device.
Claim 13
Dependent Claim
44 words
The encryption system of claim 9, said means for decrypting further comprising means for entering message bits, received after reception of said at least one of the at least two encrypted message segments, into the decryption device to recover decryption device throughput delay data.
Claim 14
Dependent Claim
17 words
The encryption system of claim 8, wherein the at least two encrypted message segments comprise encryption keys.
Claim 15
Dependent Claim
18 words
The encryption system of claim 8, further comprising means for generating said data stream by randomly selecting bits.
Claim 16
Dependent Claim
29 words
The encryption system of claim 8, said means for chaining further comprising means for placing said data stream and the at least two message segments for transmission in succession.
Claim 17
Dependent Claim
122 words
A communication unit having a decryption device for use in an encryption system having an encryption device communicating at least two message segments to the decryption device, the communication unit comprising: means for receiving an encrypted chained message comprised of a data stream at the at least two message segments chained and then encrypted; means for determining an encryption state for at least one of the at least two encrypted message segments; and means for independently decrypting said at least one of the at least two encrypted message segments by entering said encryption state followed by said at least one of the at least two encrypted message segments into the decryption device, without decrypting any other segment of said encrypted chained message.
Claim 18
Dependent Claim
122 words
A communication unit having a decryption device for use in an encryption system having an encryption device communicating at least two message segments to the decryption device, the communication unit comprising: means for receiving an encrypted chained message comprised of a data stream at the at least two message segments chained and then encrypted; means for determining an encryption state for at least one of the at least two encrypted message segments; and means for independently decrypting said at least one of the at least two encrypted message segments by entering said encryption state followed by said at least one of the at least two encrypted message segments into the decryption device, without decrypting any other segment of said encrypted chained message.
Claim 19
Dependent Claim
44 words
The communication unit of claim 15, said means for decrypting further comprising means for entering message bits, received after reception of said at least one of the at least two encrypted message segments, into the decryption device to recover decryption device throughput delay data.
Claim 20
Dependent Claim
67 words
The communication unit of claim 15, wherein said means for determining further comprises: means for setting up a holding register for said encryption state; means for filling said holding register with data from said encrypted chained message received immediately prior to receiving said at least one of the at least two encrypted message segments; and means for feeding contents of said holding register into the decryption device.
Claim 21
Dependent Claim
17 words
The communication unit of claim 15, wherein the at least two encrypted message segments comprise encryption keys.
Claim 22
Dependent Claim
98 words
A key management controller having at least one decryption device for use in an encryption system wherein the at least one encryption device communicates at least two message segments to a decryption device, the key management controller comprising: means for chaining a data stream and the at least two message segments together into a chained message; means for encrypting said chained message; and means for transferring said encrypted chained message to the decryption device, such that the decryption device independently decrypts any segment of said encrypted chained message, without decrypting any other segment of said encrypted chained message.
Claim 23
Dependent Claim
98 words
A key management controller having at least one decryption device for use in an encryption system wherein the at least one encryption device communicates at least two message segments to a decryption device, the key management controller comprising: means for chaining a data stream and the at least two message segments together into a chained message; means for encrypting said chained message; and means for transferring said encrypted chained message to the decryption device, such that the decryption device independently decrypts any segment of said encrypted chained message, without decrypting any other segment of said encrypted chained message.
Claim 24
Dependent Claim
19 words
The key management controller of claim 19, further comprising means for generating said data stream by randomly selecting bits.
Claim 25
Dependent Claim
30 words
The key management controller of claim 19, said means for chaining further comprising means for placing said data stream and the at least two message segments for transmission in succession.
Claim 26
Independent Claim
78 words
A method of communication of at least two message segments in an encryption system having an encryption device and a decryption device, comprising the steps of: generating a data stream by randomly selecting bits; chaining said data stream and the at least two message segments together into a chained message; encrypting said chained message; transmitting said encrypted chained message to the decryption device; receiving said encrypted chained message at the decryption device; and decrypting said encrypted chained message.
Claim 27
Independent Claim
78 words
A method of communication of at least two message segments in an encryption system having an encryption device and a decryption device, comprising the steps of: generating a data stream by randomly selecting bits; chaining said data stream and the at least two message segments together into a chained message; encrypting said chained message; transmitting said encrypted chained message to the decryption device; receiving said encrypted chained message at the decryption device; and decrypting said encrypted chained message.
Claim 28
Dependent Claim
85 words
An encryption system having an encryption device communicating at least two message segments to a decryption device, the encryption system comprising: means for generating a data stream by randomly selecting bits; means for chaining said data stream and the at least two message segments together into a chained message; means for encrypting said chained message; means for transmitting said encrypted chained message to the decryption device; means for receiving said encrypted chained message at the decryption device; and means for decrypting said encrypted chained message.
Claim 29
Dependent Claim
85 words
An encryption system having an encryption device communicating at least two message segments to a decryption device, the encryption system comprising: means for generating a data stream by randomly selecting bits; means for chaining said data stream and the at least two message segments together into a chained message; means for encrypting said chained message; means for transmitting said encrypted chained message to the decryption device; means for receiving said encrypted chained message at the decryption device; and means for decrypting said encrypted chained message.
References Cited (Backward Citations)
US4924513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |