http://www.truecrypt.org/
http://books.google.hu/books?id=MI93fQgoWu4C&pg=PA305&lpg=PA305&dq=ubuntu+how+to+encrypt+system&source=bl&ots=A-UwLpYOzC&sig=WtKKC0HJthXuAaRqi7xwRaq2bOA&hl=hu&ei=GN9NSqfdHsqc_Aa2ioDFBQ&sa=X&oi=book_result&ct=result&resnum=8
http://www.ubuntugeek.com/how-to-create-a-private-encrypted-folder-on-ubuntu-810-intrepid.html
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