If the typing pattern is disproportionately different (as it may be the case between switching from single to two hand typing), you would need a fall-back or risk not being authenticated. Or, you could retry typing as you would usually do during an authentication.
Thank you for sharing this, very interesting! Although a bit old (2015), the article raises some questions on privacy & transparency, which are more important than ever (eg: the increasing legislation like GDPR, CCPA).
Luckily, the TypingDNA solution is secure and compliant, in accordance not only to the Privacy laws (GDPR, CCPA), but also to other kind of legislation like Strong Customer Authentication (SCA) required by the EU Payment Services Directive (PSD2)
TypingDNA [1] recognises people by the way they type, and provides typing biometrics (aka keystroke dynamics) as a service via an API. This is currently used for Multi-Factor Authentication in industries like Banking and Education [2].
Don't take my word for granted, see it with your own eyes and even try it with a friend (can somebody else replicate your typing pattern?) [3]
There are free accounts provided to developers, so you can easily call the API yourself [4]
There is a bigger impact on the biometrics industry. Face recognition (because of the masks) is the most obvious one, but there are also fingerprint scanning and voice recognition which took a hit. As a viable alternative, typing biometrics could be the safe & user-friendly way to go (recognising people by the way they type). You can see more on this topic on the TypingDNA blog: https://blog.typingdna.com/covid-19-pandemic-challenges-the-...