Methods and software program product for mutual authentication in a communications network

The device for mutual authentication between the user and communication networks method, wherein the method, (1,1 ') comprises a random of the user terminal. A random number, for example, which a user ID, wherein escorted to the management to want access network user the data and apparatus for (6,6 '). The verifying the subsystem, wherein the identifier is used for obtaining the inspected component of the user the credential. The proof program, and user ID related parameter the data and generating, and session key is formed by said parameter is formed encrypted to the number of. , A random number of encrypted, reconfiguration to the information is provided with a terminal and session key need, and returned to a user terminal. The restructured with the session key, a user terminal and a random number, and inspected with a matching of any of which is. The seal between the two sheets are allowed to confirm a user according he/she with point is a connecting (2) is not a fake point.