Patent ID: 7676041

Claim:
A method for creating and distributing cryptographic keys in a mobile radio system, wherein the mobile radio system has at least one mobile radio terminal, a first computer, a computer of a home communications network and a second computer, the at least one mobile radio terminal and the computer of the home communications network including authentication key materials resulting from an authentication, the method comprising: creating a first cryptographic key and a second cryptographic key by the at least one mobile radio terminal and the computer of the home communications network using the authentication key materials, wherein the first cryptographic key and the second cryptographic key are created such that no inference can be made from the first cryptographic key as to the second cryptographic key, no inference can be made from the second cryptographic key as to the first cryptographic key, and no inference can be made from the first cryptographic key or from the second cryptographic key as to the authentication key materials; transmitting the first cryptographic key from one or both of the at least one mobile terminal and the computer of the home communications network to the first computer; and transmitting the second cryptographic key from one or both of the at least one mobile radio terminal and the computer of the home communications network to the second computer, wherein the first computer is a first application server computer and the second computer is a second application server computer.