Method and device for connecting packet data network

The invention provides a method for creating a unique and secure mobile internet protocol version 4 connection for a packet data network. The method includes generating an extended master session key to create a mobile internet protocol root key. The method also includes creating a mobile internet protocol security parameter index based on the mobile internet protocol root key and an access point name. The method further includes deriving a mobile node foreign agent key based on the APN. Furthermore the method includes associating the derived mobile node home agent key and mobile node foreign agent key to the created security parameter index. Moreover the method includes providing the unique and secure MIPv4 connection to transfer data for the packet data network connectivity.