Abstract: The security access control of mobile terminals and secure transmission of mobile data play an important role for the widespread usage of mobile intelligent terminals and the extension of mobile service. According to the security problem when mobile terminals access intranet, this paper put forward a secure communication scheme of mobile VPN with the aim of security exchange for mobile data. The scheme improved the negotiation process IKE protocol which is one of the important protocols in IPsec protocol suite, and the scheme can support multifactor authentication and role based access control. The results of theoretical analysis and experiments demonstrate the practicability and the security of our scheme.

Key words: IPSec virtual private network, Mobile secure access, Internet key exchange protocol, Multifactor authentication