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Truecrypt is obsolete as it can be decrypted easily.I also use linux on almost all of my computers but not even OSx is secure.There will be allways a way.Just get a old laptop and store your keys there and never connect it to the internet.Maybe make the keys on it with armory too.

100% correct trucrypt is obsolete thanks for reminding me, was the only encryption software beside bitlocker that I have tried for windblows.

You have openbsd if you're really paranoid or you could create a paper wallet using a live cd.