Patent ID: 8275403

Claim:
A security method in a mobile communications system including a home network providing support for a first basic security standard and a second improved security standard, said mobile communication system further serving at least one mobile terminal having an identity module operative according to said first basic security standard, the method comprising the steps of: in response to said at least one mobile terminal initiating a service access, determining at said home network whether said at least one mobile terminal has an executable program configured to interact with said identity module of said at least one mobile terminal for emulating an emulated identity module according to said second improved security standard; executing, provided that said at least one mobile terminal has said executable program, a security algorithm at said home network to provide security data according to said second improved security standard; transferring, transparently to a visited network, at least part of said security data of said second improved security standard to said at least one mobile terminal; executing, at said at least one mobile terminal, said executable program configured to interact with said identity module of said at least one mobile terminal for emulating said emulated identity module according to said second improved security standard, using at least part of said security data as input, to provide improved security for protected communication between said at least one mobile terminal and a network side.