Shell/2fa-example

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~$ google-authenticator 

Do you want authentication tokens to be time-based (y/n) y
https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/ub@login%3Fsecret%3DGZKEJDUEZRJT7
                                                                          
Your new secret key is: GZLKWLCOEJDHZTQ7
Your verification code is 990847
Your emergency scratch codes are:
  20361303
  92685272
  94486722
  54926391
  92920698

Do you want me to update your "/afs/informatik.uni-goettingen.de/user/u/username/.google_authenticator" file (y/n) y

Do you want to disallow multiple uses of the same authentication
token? This restricts you to one login about every 30s, but it increases
your chances to notice or even prevent man-in-the-middle attacks (y/n) y

By default, tokens are good for 30 seconds and in order to compensate for
possible time-skew between the client and the server, we allow an extra
token before and after the current time. If you experience problems with poor
time synchronization, you can increase the window from its default
size of 1:30min to about 4min. Do you want to do so (y/n) y

If the computer that you are logging into isn't hardened against brute-force
login attempts, you can enable rate-limiting for the authentication module.
By default, this limits attackers to no more than 3 login attempts every 30s.
Do you want to enable rate-limiting (y/n) n

(( For some time now the secrets are longer. E.g.: 6BTNE63LZZGTMZXRA6JIT4PFUQ ))

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