Patent ID: 6373949
Filing Date: 2002-04-16
Classification: H04W

Abstract:
A method for protected transmission of user identity to the user's home network in a data communications system that includes at least, subscribers each with a unique identifier and a home network, subscriber stations of the subscribers, at least one data communications network including network elements, and in which connections can be made between mobile stations and the data communications network, the method comprising:dividing an identifier into a first and second section in such a way that the first section includes data necessary for identifying a subscriber group and the second section identifies a subscriber within the subscriber group generating a random input at a subscriber station, encrypting the second section of the subscriber's identifier using the random input and a cipher key specific to each subscriber group, sending a message to a network element of a data communications network, the message containing a partially encrypted identifier consisting of the first section and the encrypted second section and the random input used, routing the message from the data communications network to the subscriber's home network, and deciphering the identifier in the subscriber's home network.