US5557676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Authentication for analog communication systems
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1995-04-20
•
Granted: 1996-09-17
•
Expires: 2015-04-20
Abstract
Abstract A method and system for authenticating the identification of mobile stations during system access is disclosed. A modified electronic serial number, including an encoded COUNT value, sent by the mobile station is compared with a modified electronic serial number corresponding to that mobile station stored in system memory. In this way, fraudulent use can be deterred and detected without changing the specification of information to be transmitted over the air interface in existing radiocommunication systems.
Inventors
- 👤 Jonas Naslund
- 👤 Thomas Johansson
- 👤 Johan Dahlstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:37
CPC Classifications
H; H04; H04W; H04W12/00; H04W12/06; H04W12/068; H04W12/08; H04W12/082; H04W12/12; H04W12/126; H04W12/60; H04W12/69; H04W12/71
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
154 words
A method for authenticating an identification of a remote station in a radiocommunication system comprising the steps of: incrementing a first value stored in said remote station in response to each occurrence of at least one predetermined event; calculating in the remote station a first modified value of an identification code of said remote station known to said remote station and to said system using said first value as an input; incrementing a second value stored in said system in response to said each occurrence of at least one predetermined event; calculating, in said system, a second modified value of said identification code of said remote station known to said remote station and to said system by using said second value as an input; transmitting said first modified value from said remote station to said system, and comparing said first modified value to said second modified value to authenticate identification of said remote station.
Claim 2
Independent Claim
154 words
A method for authenticating an identification of a remote station in a radiocommunication system comprising the steps of: incrementing a first value stored in said remote station in response to each occurrence of at least one predetermined event; calculating in the remote station a first modified value of an identification code of said remote station known to said remote station and to said system using said first value as an input; incrementing a second value stored in said system in response to said each occurrence of at least one predetermined event; calculating, in said system, a second modified value of said identification code of said remote station known to said remote station and to said system by using said second value as an input; transmitting said first modified value from said remote station to said system, and comparing said first modified value to said second modified value to authenticate identification of said remote station.
Claim 3
Independent Claim
86 words
A method for authenticating an identification of a remote station in a radiocommunication system comprising the steps of: incrementing a first value stored in said remote station in response to each occurrence of at least one predetermined event; incrementing a second value stored in said system in response to said each occurrence of at least one predetermined event; and using said first and second values to authenticate identification of said remote station by indirectly transmitting said first value to said system via modification of redundant information.
Claim 4
Independent Claim
86 words
A method for authenticating an identification of a remote station in a radiocommunication system comprising the steps of: incrementing a first value stored in said remote station in response to each occurrence of at least one predetermined event; incrementing a second value stored in said system in response to said each occurrence of at least one predetermined event; and using said first and second values to authenticate identification of said remote station by indirectly transmitting said first value to said system via modification of redundant information.
Claim 5
Dependent Claim
42 words
The method of claim 2 further comprising the steps of: determining, in said remote station, a first modified identification number based on at least said first value and an original identification number, and transmitting said first modified identification number to said system.
Claim 6
Dependent Claim
33 words
The method of claim 3, wherein said step of determining further comprises the step of: determining said first modified identification number also based on at least one of: a PIN and a B-number.
Claim 7
Dependent Claim
22 words
The method of claim 3, wherein said first modified identification number has a same number of bits as said original identification number.
Claim 8
Dependent Claim
17 words
The method of claim 2, wherein said first value is incremented before said second value is incremented.
Claim 9
Dependent Claim
39 words
The method of claim 2, wherein said at least one predetermined event comprises at least one of: traffic channel assignment, an origination signal, registration, beginning to transmit, receiving and looping back of a SAT tone and an on-hook signal.
Claim 10
Dependent Claim
59 words
The method of claim 3 further comprising the steps of: after receiving said first modified identification number from said remote station, determining, in said system, a second modified identification number based on at least said second value and an original identification number, and comparing said first and said second modified identification numbers to authenticate identification of said remote station.
Claim 11
Dependent Claim
17 words
The method of claim 2, wherein the redundant information comprises information used for purposes other than encryption.
Claim 12
Dependent Claim
13 words
The method of claim 2, wherein the redundant information comprises a CRC field.
Claim 13
Independent Claim
102 words
A system for authenticating identification of a remote station in a radiocommunication network comprising: means, disposed in said remote station, for incrementing a first value stored in said remote station in response to each occurrence of at least one predetermined event; means, disposed in said network, for incrementing a second value stored in said network in response to said each occurrence of at least one predetermined event; and means, disposed in said network, for using said first and second values to authenticate identification of said remote station by indirectly receiving said first value from said remote station via modification of redundant information.
Claim 14
Independent Claim
102 words
A system for authenticating identification of a remote station in a radiocommunication network comprising: means, disposed in said remote station, for incrementing a first value stored in said remote station in response to each occurrence of at least one predetermined event; means, disposed in said network, for incrementing a second value stored in said network in response to said each occurrence of at least one predetermined event; and means, disposed in said network, for using said first and second values to authenticate identification of said remote station by indirectly receiving said first value from said remote station via modification of redundant information.
Claim 15
Dependent Claim
49 words
The system of claim 11, further comprising: means, disposed in said remote station, for determining a first modified identification number based on at least said first value and an original identification number, and means, disposed in said remote station, for transmitting said first modified identification number to said network.
Claim 16
Dependent Claim
30 words
The system of claim 12, wherein said means for determining is also for determining said first modified identification number based on at least one of a PIN and a B-number.
Claim 17
Dependent Claim
22 words
The system of claim 12, wherein said first modified identification number has a same number of bits as said original identification number.
Claim 18
Dependent Claim
70 words
The system of claim 12, further comprising: means, disposed in said network, for receiving said first modified identification number from said remote station; means, disposed in said network, for determining a second modified identification number based on at least said second value and an original identification number, and means, disposed in said network, for comparing said first and said second modified identification numbers to authenticate identification of said remote station.
Claim 19
Dependent Claim
34 words
The system of claim 11, wherein said means for incrementing said first value operates before said means for incrementing said second value in response to said each occurrence of at least one predetermined event.
Claim 20
Dependent Claim
39 words
The system of claim 11, wherein said at least one predetermined event comprises at least one of: traffic channel assignment, an origination signal, registration, beginning to transmit, receiving and looping back of a SAT tone and an on-hook signal.
Claim 21
Dependent Claim
22 words
The system of claim 11, wherein the redundant information comprises identification number of the remote station used for purposes other than encryption.
Claim 22
Dependent Claim
13 words
The system of claim 11, wherein the redundant information comprises a CRC field.
Claim 23
Dependent Claim
77 words
A remote station for communicating with a radiocommunication system comprising: a memory in which a value is stored; a counter to increment said stored value in response to each occurrence of at least one predetermined event; a processor for modifying an original identification number associated with said remote station based on said stored value to generate a modified identification number; and a transmitter which transmits a signal including said modified identification number but not said stored value.
Claim 24
Dependent Claim
77 words
A remote station for communicating with a radiocommunication system comprising: a memory in which a value is stored; a counter to increment said stored value in response to each occurrence of at least one predetermined event; a processor for modifying an original identification number associated with said remote station based on said stored value to generate a modified identification number; and a transmitter which transmits a signal including said modified identification number but not said stored value.
Claim 25
Dependent Claim
109 words
A base station for communicating with a remote station in a radiocommunication system comprising: a memory in which a count value and a subscriber identification number is stored; a counter to increment said count value in response to each occurrence of at least one predetermined event; a receiver for receiving a signal from said remote station including a modified identification number; and processing means for retrieving an identification number from said memory which corresponds to the remote station, determining an expected modified identification number using said retrieved identification number and said count value, and authenticating an identification of said remote station using at least said expected modified identification number.
Claim 26
Dependent Claim
109 words
A base station for communicating with a remote station in a radiocommunication system comprising: a memory in which a count value and a subscriber identification number is stored; a counter to increment said count value in response to each occurrence of at least one predetermined event; a receiver for receiving a signal from said remote station including a modified identification number; and processing means for retrieving an identification number from said memory which corresponds to the remote station, determining an expected modified identification number using said retrieved identification number and said count value, and authenticating an identification of said remote station using at least said expected modified identification number.
Claim 27
Dependent Claim
25 words
The base station of claim 21 wherein said processing means is also for comparing said expected modified identification number with said received modified identification number.
Claim 28
Dependent Claim
19 words
The method of claim 1, wherein said first value is used as a key to encrypt said identification code.
Claim 29
Dependent Claim
19 words
The method of claim 2, wherein said first value is used as a key to encrypt said redundant information.
Claim 30
Dependent Claim
19 words
The system of claim 9, wherein said first value is used as a key to encrypt said redundant information.
Claim 31
Dependent Claim
21 words
The remote station of claim 16, wherein said stored value is used as a key to encrypt said original identification number.
Claim 32
Dependent Claim
19 words
The base station of claim 17, wherein said count value is used to decrypt said received modified identification number.
References Cited (Backward Citations)
US4023012A
Cited
US4315101A
Cited
US4535333A
Cited
CA1236532A
Cited
US4814741A
Cited
JPH01272241A
Cited
US5101500A
Cited
US4958368A
Cited
WO1991001067A2
Cited
US4955049A
Cited
US4972355A
Cited
US5060266A
Cited
US5091942A
Cited
US5237612A
Cited
US5317636A
Cited
US5369706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-17 | 2000-03-18 | 2000-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-17 | 2004-03-18 | 2004-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-17 | 2008-03-18 | 2008-09-17 | $7700.00 | Window Closed / Lapsed |