| 5613214 |
Mobile communication terminal authenticating system |
| Mar-18-1997 |
A mobile communication terminal authenticating system for renewing an authenticating key without transmitting the authenticating key between the mobile communication terminal and the mobile communication... |
| 5594795 |
Method and apparatus for key transforms to discriminate between different networks |
| Jan-14-1997 |
A method and apparatus is presented for transforming a key variable used for scrambling cellular data traffic between a terminal and a network in alternate ways using information transmitted to the terminal... |
| 5592555 |
Wireless communications privacy method and system |
| Jan-7-1997 |
A method and system for privately communicating signals over a wireless communications network include the steps of and circuitry and instructions for processing communication signals in a first signal... |
| 5561853 |
Method and apparatus for determining the assignment of a mobile station to equipment lists |
| Oct-1-1996 |
In the prior art, equipment lists (B, G, W) are searched successively, or a list is searched which contains all equipment numbers (MEI.sub.1 to MEI.sub.n) along with the respective equipment lists to which... |
| 5559886 |
Method of carrying out an authentication check between a base station and a mobile station in a mobile radio system |
| Sep-24-1996 |
Methods for carrying out an authentication check in a mobile telephone system in which an authentic base station serves a plurality of mobile stations. A prior method carried out a unidirectional check... |
| 5557676 |
Authentication for analog communication systems |
| Sep-17-1996 |
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... |
| 5557654 |
System and method for authenticating subscribers of a transmission network and subscription, having differing authentication procedures, using a common authentication center |
| Sep-17-1996 |
A telecommunication system and a method for authenticating a subscriber in a telecommunication system. The system includes a transmission network having subscriber identity codes of a first format and... |
| 5551073 |
Authentication key entry in cellular radio system |
| Aug-27-1996 |
A mobile station is disclosed which may be operated in both a set-up programming mode and in an authentication key programming mode. The authentication key programming mode may be invoked through a series... |
| 5544245 |
Mutual authentication/cipher key delivery system |
| Aug-6-1996 |
The network and each user i share an encryption algorithm EK.sub.i () using his authentication key K.sub.i as a cipher key, its inverse function EK.sub.i.sup.-1 (), a specific function F() and its inverse... |
| 5541977 |
Method and apparatus for preventing wireless fraud |
| Jul-30-1996 |
The use of stolen mobile identification number (MIN) and electronic serial number (ESN) information to fraudulently place wireless calls is prevented by having the switches of multiple wireless carriers... |
| 5517567 |
Key distribution system |
| May-14-1996 |
A system for securely distributing a communications key from a master unit to a remote unit for use in cryptographic communications between the master and remote units employs first and second secret numbers... |
| 5513245 |
Automatic generation of private authentication key for wireless communication systems |
| Apr-30-1996 |
Apparatus and method for automatically generating an authentication key (A-Key) in a mobile station wherein the mobile station periodically receives random numbers from a base station, and automatically... |
| 5488649 |
Method for validating a communication link |
| Jan-30-1996 |
The method of the present invention generally validates a communication link in a communication system. In particular, the method validates a communication link between a cordless base station and authorization... |
| 5455863 |
Method and apparatus for efficient real-time authentication and encryption in a communication system |
| Oct-3-1995 |
Radio frequency based cellular telecommunication systems often require both subscriber units and communication units of a fixed network communication system to maintain secret data which may be used to... |
| 5420908 |
Method and apparatus for preventing wireless fraud |
| May-30-1995 |
The use of stolen mobile identification number (MIN) and electronic serial number (ESN) information to fraudulently place wireless calls is prevented by having the switches of multiple wireless carriers... |
| 5402490 |
Process for improving public key authentication |
| Mar-28-1995 |
An environment which includes a communications network, user terminals, and an authentication center provides communication services only to legitimate subscribers. The authentication center receives an... |
| 5398285 |
Method for generating a password using public key cryptography |
| Mar-14-1995 |
In a communication system, a password that enables an embedded software program within a base station can be generated using public key cryptography in the following manner. A system controller (103) obtains... |
| 5392356 |
Mobile telephone terminal and method of preventing unlawful use thereof |
| Feb-21-1995 |
A first ID code ESN (electronic serial number) for apparatus identification and a second ID code MIN (mobile identification number) such as a telephone number are stored beforehand in a non-volatile memory... |
| 5392355 |
Secure communication system |
| Feb-21-1995 |
A process for assuring secure communication over a radio link and apparatus to perform the process includes a scrambler-descrambler installed at a multiple line input multiple line output telephone switch.... |
| 5390252 |
Authentication method and communication terminal and communication processing unit using the method |
| Feb-14-1995 |
In a first processing mode for a first communication request, a communication processing unit responds to a communication request signal from a communication terminal to acquire an authentication key Ka... |
| 5390245 |
Method of carrying out an authentication check between a base station and a mobile station in a mobile radio system |
| Feb-14-1995 |
Methods for carrying out an authentication check in a mobile telephone system in which an authentic base station serves a plurality of mobile stations. A prior method carried out a unidirectional check... |
| 5384847 |
Method and apparatus for protecting cordless telephone account authentication information |
| Jan-24-1995 |
The present invention provides an apparatus for use in a telecommunication system which includes a local unit such as a cordless telephone handset and a remote unit. The apparatus generates an encrypted... |
| 5345506 |
Mutual authentication/cipher key distribution system |
| Sep-6-1994 |
A communication network and its user i has a device for implementing a common key cryptosystem, an identifier of the user i represented by ID.sub.i which is made public in the network, an authentication... |
| 5325419 |
Wireless digital personal communications system having voice/data/image two-way calling and intercell hand-off |
| Jun-28-1994 |
A wireless digital personal communications system (or PCS) having a plurality of intelligent base stations and portable handset terminals, each having a predetermined radio cell coverage area. The radio... |
| 5319711 |
Wireless device for verifying identification |
| Jun-7-1994 |
A wireless communication device using a verification protocol for verifying the identification of the wireless device by a wireless network control station in the presence of eavesdroppers is disclosed.... |
| 5309501 |
Arrangement for detecting fraudulently identified mobile stations in a cellular mobile telecommunications network |
| May-3-1994 |
Apparatus and methods for providing cellular mobile telecommunication service in accordance with the requirements of the Global Systems for Mobile Communications (GSM) standard. A modular switching system... |
| 5301234 |
Radiotelephone installation for prepayment operation with security protection |
| Apr-5-1994 |
In the course of the intercommunication between the base station and the autonomous telephone set, the first means of authentication initially generates a keyword dependent on the call charge for the current... |
| 5282250 |
Method of carrying out an authentication check between a base station and a mobile station in a mobile radio system |
| Jan-25-1994 |
Methods for carrying out an authentication check in a mobile telephone system in which an authentic base station serves a plurality of mobile stations. A prior method carried out a unidirectional check... |
| 5241598 |
Rolling key resynchronization in cellular verification and validation system |
| Aug-31-1993 |
A system for the resynchronization of a rolling key used as an input among a plurality of inputs to an authentication algorithm executed in a mobile station and in a radio network providing service to... |
| 5237612 |
Cellular verification and validation system |
| Aug-17-1993 |
A system for the validation and verification of base stations and mobile stations within a cellular radio communications network. The system includes a fixed key and a changeable key which are applied... |
| 5153919 |
Service provision authentication protocol |
| Oct-6-1992 |
A protocol for authenticating a cellular telephone to a service provider for the purpose of preventing the piracy of cellular services. A service provider assigns a unique "secret", along with other information... |
| 5150412 |
Security module for radio telephone |
| Sep-22-1992 |
A security module for a radio telephone prevents a KEY code stored in a non-volatile memory from being read out for illicit use. The security module deletes the KEY code stored in the memory when accessed... |
| 5060264 |
Radiotelephone controller configured for coresident secure and nonsecure modes |
| Oct-22-1991 |
A controller for a radiotelephone having the capability of operation in both a secure mode for call authorization and a nonsecure mode for user interface is disclosed. The nonsecure mode and secure mode... |
| 4626845 |
Subscriber validation system |
| Dec-2-1986 |
A system provides for the validation of users of a trunked radio system. The system includes a controller and at least one microcomputer-controlled repeater module for user identification and validation.... |
| 4574163 |
Digital radio telephone |
| Mar-4-1986 |
A two-way digital radio telephone system includes means for transmitting by RF carrier 16 bit binary words including a start bit, a six bit identification code and eight bits of information comprising... |
| 4555805 |
Secure mobile telephone system |
| Nov-26-1985 |
A communications system including a central station and a plurality of remote stations, for example, a mobile telephone system, is disclosed in which communications channel establishing signalling transmissions... |
