Topic: Running rake task automatically with rights of server?

I have a task that I would like to have run automatically throughout the day without user intervention (guessing I would use a cron job to run a rake task). It will be reading in an RSS feed and using that data to update a database. The application is secure, using https and requiring user certs. So how do you go about having an automated task run with basically the rights of the server, as opposed to passing in user credentials?