How do I encrpyt files on my 12.04 installation?

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http://askubuntu.com – I need to encrypt some files on my machine. I did not select the option do encrypt my home folder at installation, but since there was an option to do so I am guessing that Ubuntu has some inbuilt encryption utility. If so, what is it and can I use it to encrypt certain files on my system (not just home folder) ?? (HowTos)