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Avoiding the creep factor in authentication

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I have recently seen a number of WiKID competitors announced in the two-factor authentication market that seek to reduce the need for user interaction.

The latest is a solution that turns on your microphone and records the ambient sound.  This is just creepy:

The system works like this: when the user enters his username and password into a website that offers Sound-Proof 2FA, the website switches on the computer's microphone and starts recording. At the same time, it pings the Sound-Proof app which does the same.

eavesdropping barbieThere is a security benefit in active involvement by users in the authentication process.  Knowledgeable, aware users are a good thing.  Recording, monitoring, tracking, less so.  Solutions such as these rely on a presumption of an acceptable rate of false positives and negatives.  When an activity is outside of the acceptable rate, then there is a fall-back procedure to other, stronger forms of authentication.  Which begs the question: why not just use the other form of strong authentication?  

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