http://zqktlw5bf6oycxq6qod452xnvdfcqhfwliz54bkul736g6b454jrk2ad.onion/wiki/index.php?title=Intrusive_Surveillance&action=edit
Please read this guide carefully, as there are many subtleties than can catch you off-guard. To protect against the legal snafus mentioned above, I prefer a bit different approach than that given on the Wiki for actual device creation. I prefer to use GPG to encrypt the filesystem key, and have the passphrase I type into the keyboard be the password to the GPG key.