CVE-2015-7225: "shoulder-surfing" vulnerability

September 6, 2017 (updated September 21, 2017)

In order to be fully RFC compliant for TOTPs, no valid OTP may be used more than once for a given timestep.

References

github.com/tinfoil/devise-two-factor/blob/master/UPGRADING.md
github.com/tinfoil/devise-two-factor/issues/30
github.com/tinfoil/devise-two-factor/pull/43

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