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I use Google Authenticator on my SSH servers with Andoid app for generating codes.

After I run $ google-authenticator application create set of emergyncy keys:

https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/user@machine%3Fsecret%ABCDEFGHIJKLMNOP
Your new secret key is: ABCDEFGHIJKLMNOP
Your verification code is 123456
Your emergency scratch codes are:
  12345678
  90123456
  78901234
  56789012
  34567890

What can I do if used all 5 codes? How can I generate new set? If I run $ google-authenticator it will generate new key ABCDEFGHIJKLMNOP and Android app stop working until I setup new key.

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5

.google_authenticator in your home directory should list the rescue codes. Just add new ones.

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