AT90USBKEY project suggestions

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I am new to using AVR and tying to start a project with the USBKEY and wanted to get some suggestions. I am trying to use the key in host mode to get an athorization code from another standard memory USB memory stick to compare to an internally stored value and if it is =, to command an output pin high for a set amount of time.

Eventually I plan on implementing an encryption algorithm.

I plan on using AVR studio with the in system programmer.

Any help would be greatly appreciated. :)

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You are just newly know what is a car and want to drive a Ferrari. :shock:
Why don't you try something simpler and maturing your AVR programming experience.
USB projects using AT90USB family is not a simple thing, reading your needs I would say, you need to have a AT90USBKey programmed as USB mass storage host, on top of it sits an implementation of FAT decoding system, finding the defined authorization code file, doing some further decryption (if any) and compare routines then outputs some indication signal.
Notice that, this is a big diagram block. There are many small details ahead.
Try Dean's MyUSB for your start. Good luck :twisted:

KISS - Keep It Simple Stupid!