Devin Martin committed ce4a08e

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 *Google 2 Step Verification
 *Amazon Web Services Multi Factor Authentication
 *Dropbox two-step verification
 *Any standard TOTP (Timed One Time Password) implementation that uses SHA1 as the HMAC hasing algorithm (the underlying library supports all hashes in the TOTP RFC specification so other hashing algorithms are possible) that let you have the secret key.
 == Installation ==