Hello Monks

I have to work on a program which will connect to a secured site give username&password and then download certain files.
I need some help on how to go about this using perl like what lib's are needed etc.

Update:
Its basically "https" site. The client provided us certificate which I installed in browser and able to connect
to their site using username and password. Now I have to automate this task using a program thats where I stopped.