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  • What if, in two weeks someone found the key? How would I ensure it was worthless? Commented Dec 23, 2013 at 8:54
  • @chipperyman573: You can add session to that key. Now a days it is being done. E.g while confirmation of mail id or mobile no, passphrase in being sent, which is valid for particular time. So you can try adding that passphrase.. Commented Dec 23, 2013 at 9:25