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Class Information
Number: 380/248
Name: Cryptography > Cellular telephone cryptographic authentication > Visiting center
Description: Subject matter wherein authorization to a cellular system other than the subscriber’s home system is processed through an intermediary.

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
5799084 System and method for authenticating cellular telephonic communication Aug. 25, 1998
5748742 Fraud detection and user validation system for mobile earth terminal communication device May. 5, 1998
5668875 Method and apparatus for authentication in a communication system Sep. 16, 1997
5661806 Process of combined authentication of a telecommunication terminal and of a user module Aug. 26, 1997
5642401 System and method of authenticating a service request in a mobile communication system Jun. 24, 1997
5615267 Method for adaptively switching between PCS authentication schemes Mar. 25, 1997
5596641 Authentication method for mobile communications Jan. 21, 1997
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
5537474 Method and apparatus for authentication in a communication system Jul. 16, 1996
5428665 Method of managing supplementary service procedures in GSM/VLR towards HLR Jun. 27, 1995
5400390 Method for establishing an inbound call to the mobile telephone in a GSM cellular mobile telephone network Mar. 21, 1995
5377267 Method of authentication with improved security for secrecy of authentication key Dec. 27, 1994
5335278 Fraud prevention system and process for cellular mobile telephone networks Aug. 2, 1994
5329573 Arrangement for obtaining authentication key parameters in a cellular mobile telecommunications switching network Jul. 12, 1994
5241598 Rolling key resynchronization in cellular verification and validation system Aug. 31, 1993
5239294 Method and apparatus for authenication and protection of subscribers in telecommunication systems Aug. 24, 1993
5237612 Cellular verification and validation system Aug. 17, 1993
5233656 Telephone installation for the remote loading of telephone rental data of an independent station Aug. 3, 1993
5204902 Cellular telephony authentication arrangement Apr. 20, 1993

1 2 3 4

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