Project Abacus is part of Google's plan to help remove the burden of passwords and login PINs.

The latest update from Google on the project indicates a plan to introduce a system to developers before the end of this year.

With Project Abacus, users would instead unlock devices or sign into applications based on a cumulative “Trust Score.” This score would be calculated using a variety of factors, including your typing patterns, current location, speed and voice patterns, facial recognition, and other things. Google Says It'll Bring Password-Free Logins to Android Apps [techcrunch.com]

This is the part that will attract the attention of privacy campaigners.

Project Abacus is a bit different. It runs in the background on your device to continually collect data about you to form its Trust Score.