How can you encrypt files?

Hi, ive been working on an application and i have been wondering how u can encrypt files. I would appreciate any advice anyone could offer as to how you might come up with your own algorithm.
Thanks
Mike

Why would you want to come up with your own encryption algorithm?
Start here for encryption in Java:
http://java.sun.com/j2se/1.4.2/docs/guide/security/CryptoSpec.html

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