file encryption that root cannot read

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http://askubuntu.com – I have regular user access to a friend's root server. I can put my data there and he (as a normal user) could not read my data, but with the root account he could. If I use something like en encrypted home folder, he could still read the data when I am logged in. Is there some way to protect the data in a way that only I can read it and not root? (HowTos)