US Patent No: 5,991,405
Number of patents in Portfolio can not be more than 2000
Method for dynamically updating cellular phone unique encryption keys
Stats
-
Nov 23, 1999
Issued date -
Jan 27, 1998
filing date -
09/014,121
serial no -
In Force
status
Importance
Loading Importance Indicators...
Abstract
In a method for dynamically updating a cellular-phone-unique-encryption key previously stored in, and common to, each of a cellular phone and an associated home location register (HLR) for providing security in a cellular-phone-network operation, a random number and shared secret random data generated at least partly based on the random number are transmitted and verified between the cellular phone and the associated HLR. A previously stored version of the cellular-phone-unique-encryption key is then dynamically updated in both the cellular phone and in the HLR by independent calculations based on an algorithm using the shared secret random data and the previously stored version of the cellular-phone-unique-encryption key. In this manner, the cellular-phone-unique-encryption key is dynamically updated as desired, e.g., each time a user initiates a call, and the latest version of the cellular-phone-unique-encryption key independently calculated by the cellular phone and the HLR is not transmitted during the updating process, thereby substantially eliminating the possibility of the latest version of the cellular-phone-unique-encryption key being intercepted during transmission by unauthorized parties.
Loading the Abstract Image...
First Claim
Related Publications
Loading Related Publications...
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
|
|
|||
| 5,375,169 Cryptographic key management method and apparatus | 103 | 1993 | |
|
|
|||
| 5,661,806 Process of combined authentication of a telecommunication terminal and of a user module | 96 | 1995 | |
|
|
|||
| 5,680,457 System for updating an authorization memory | 21 | 1995 | |
|
|
|||
| 5,204,902 Cellular telephony authentication arrangement | 105 | 1991 | |
|
|
|||
| 5,499,297 System and method for trusted path communications | 107 | 1994 | |
|
|
|||
| 5,586,185 Communications system capable of communicating encrypted information | 20 | 1995 | |
|
|
|||
| 5,404,404 Method for updating encryption key information in communication units | 52 | 1993 | |
|
|
|||
| 5,325,432 Method for updating encryption key information in communication units | 111 | 1993 | |
|
|
|||
| 5,146,498 Remote key manipulations for over-the-air re-keying | 33 | 1991 | |
|
|
|||
| 5,613,214 Mobile communication terminal authenticating system | 28 | 1994 | |
|
|
|||
| 5,513,245 Automatic generation of private authentication key for wireless communication systems | 57 | 1994 | |
|
|
|||
| 5,490,201 Method in conjunction with updating one or more HLR-databases included in a mobile telephone system | 28 | 1993 | |
|
|
|||
| 5,123,047 Method of updating encryption device monitor code in a multichannel data encryption system | 8 | 1991 | |
|
|
|||
| 5,655,004 Method and apparatus for detection of cellular phone fraud | 22 | 1995 | |