Securing wireless java programs (MY HELL)

hello, you very helpful people!!!
i'm currently looking at writing a java program provide an alternative to the DHCP function on a wireless router which is really conveinient but rubbish for security!
The program will do a similar job by having a client/server program.
The client runs a program, enters a username and password
The details are then checked by a authentication server if they are correct the server sends the client an ip address as a string
The client runs a command line and uses a microsoft tool Netsh to change its own IP setting
The client should then be able to communicate to the wireless router.
All the convienience of DHCP but a little bit more secure.
My problem is for this program to be effective i need some sort of encryption so the IP address sent by the server cant be sniffed.
I would appreachiate it anyone has some links to sample client/server programs that use encryption or can suggest an approach.
You have to remember however that encryption over wireless client/server is a lot more tricky as the link is often unstable a property not liked by most encryption!!!
thanks in advance
mike

Try not to reproduce the errors that were made when the crypto algorithms for IEEE 802.15 (WiFi) were defined.
The crypto scheme was weak and was broken easily.

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