Patent ID: 8345882

Claim:
A method for safeguarding data traffic between a first terminal communicating with a first network via a first interface, and a second terminal communicating with a second network via a second interface, comprising: connecting the first terminal to the second terminal via a local interface, the first terminal communicating in the first network using at least one first session key to encrypt/decrypt first messages and the second terminal communicating in the second network using at least one second session key to encrypt/decrypt second messages; determining the at least one first session key in the first terminal; deriving the at least one second session key from the at least one first session key in the first terminal, wherein the at least one second session key is not derived by the second terminal and the at least one first session key is not transmitted to the second terminal; transmitting the at least one second session key to the second terminal via the local interface using a security protocol; authenticating the second terminal to the second network using an authentication protocol based on at least one of the at least one second session key and keys derived from the at least one second session key.