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5991407 |
Subscriber authentication in a mobile communications system
An authentication procedure in a Global System for Mobile Communications (GSM)-based mobile communications system relies on a challenge and response principle. A 32-bit Signed Response (SRES)...
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5940512 |
Roaming method capable of improving roaming registration procedure
A roaming terminal enciphers a subscriber's number thereof using a public key of a home network and sends the enciphered subscriber's number to the home network via a roamed network. The home...
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5799084 |
System and method for authenticating cellular telephonic communication
A system and method for authenticating a mobile station (MS) in a cellular network. The present invention is an authentication technique that uses the AMPS standard, or a derivative thereof, can...
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5668875 |
Method and apparatus for authentication in a communication system
A method and apparatus for authenticating a roaming subscriber. In a preferred embodiment, a subscriber receives a challenge that is in a format of a local authentication protocol, and determines...
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5661806 |
Process of combined authentication of a telecommunication terminal and of a user module
The terminal and the user module are authenticated in a combined manner on the basis of an authentication key calculated on the one hand by the terminal and on the other hand by the network. A...
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5642401 |
System and method of authenticating a service request in a mobile communication system
An authentication system includes a mobile station, a base station, a mobile station controller, and a data base. When the base station determines that authentication is required, an authentication...
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5615267 |
Method for adaptively switching between PCS authentication schemes
A method for adaptively switching between the WS and S authentication schemes is based on the customer's usage. A first preferred embodiment provides a 2n-1 state automaton (where n>1), which...
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5596641 |
Authentication method for mobile communications
In the preliminary authentication stage, the mobile station (35) is authenticated by sending from the home network (30) to the roamed network (31), a plurality of pairs of first random numbers...
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5557654 |
System and method for authenticating subscribers of a transmission network and subscription, having differing authentication procedures, using a common authentication center
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...
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5428665 |
Method of managing supplementary service procedures in GSM/VLR towards HLR
In a Mobile Services Switching Center/Visitor Location Register (MSC/VLR), requests (made by a mobile station (MS)) for supplementary services may require processing only by the MSC/VLR, or they...
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5400390 |
Method for establishing an inbound call to the mobile telephone in a GSM cellular mobile telephone network
A method for setting up an inbound call to a mobile telephone MS in a cellular mobile telephone network. In the method, a mobile switching center (MSC) requests a home location register (HLR) to...
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5377267 |
Method of authentication with improved security for secrecy of authentication key
A method of subscriber authentication suitable for a roaming service in a telecommunication capable of realizing an improved security for the secrecy of the authentication key. In this method, an...
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5335278 |
Fraud prevention system and process for cellular mobile telephone networks
An improved mobile telephone system, including a process and apparatus for detecting fraudulent requests for roamer cellular telephone services before the requested service is granted. The...
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5329573 |
Arrangement for obtaining authentication key parameters in a cellular mobile telecommunications switching network
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...
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5241598 |
Rolling key resynchronization in cellular verification and validation system
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...
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5239294 |
Method and apparatus for authenication and protection of subscribers in telecommunication systems
Radio frequency based cellular telecommuication systems often require a subscriber (10) to maintain a proprietary identifier (19) or serial number (18) which is transmitted to a fixed network...
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5237612 |
Cellular verification and validation system
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...
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5233656 |
Telephone installation for the remote loading of telephone rental data of an independent station
In a telephone installation, telephone rental data is loaded remotely into an independent station in the following manner. In response to a request for a call coming from the independent station...
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5204902 |
Cellular telephony authentication arrangement
A secure cellular telephony arrangement where the mobile unit maintains a secret that is assigned to it by the service provider, and which is known to the provider (home cellular geographic service...
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