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Prevention of devices using same OTP secret

Posted on July 20, 2017 by rcorreia

I have a requirement of OTP applications on mobile devices not sharing the same secret (even if the mobile devices are owned by the same user). A single secret must be present in a single device.

Open source applications tha… Continue reading Prevention of devices using same OTP secret→

How many known time/result combinations does it take to guess a HOTP/TOTP secret?

Posted on June 20, 2017 by Kevin Morssink

I thought about “recovering”, “determining”, “guessing”, “calculating” or “reproducing” the HOTP/TOTP secrets when only the outcome (6-digit code + time) is known.

In case we can view the live creation of HOTP/TOTP codes without knowing t… Continue reading How many known time/result combinations does it take to guess a HOTP/TOTP secret?→