Create a program for client/server, and encrypt/decrypt messages by public/private keys.
What do you expect from us?
Hey cyber-girl and welcome to the forums.
Like I like serena implied above, you can't expect people here just to do your work for you: you will need to show initiative and provide us with your thoughts and ideas on the matter as well as your efforts through your worked out thoughts as well as any code you have written.
Separate names with a comma.