One of the most important issues when using WhatsApp users is the security of conversations and do not put them in the wrong hands. That's why the application would develop new ways of protecting new users.
In this case, a new measure to implement allows users to activate the lock by fingerprint. This information was expanded through the WaBetaInfo site, which specializes in the search for WhatsApp's latest search.
Depending on the portal, this feature would work with all Android operating systems with Android Marshmallow and would be called "Authentication" in the privacy settings.
Enabling this feature will protect all of the functions provided by the application, whether external or dialogues. So it is necessary to unlock all fingerprinting on WhatsApp.
However, there is not yet a specific date for the arrival of the lock.