Neural Network Typing Authentication TJ STAR Luke Knepper lukeknep@stanford.edu

The Dilemma Passwords can sometimes be suboptimal Advanced biometrics are expensive Need an alternative

A Solution Authenticate people by how they type Typing patterns differ by person  user’s specific typing characteristics will be used for authentication Cheap and flexible to implement

Background Measures users' typing patterns, compares to a previous standard Technique first used in WWII Works with ~90% Accuracy Effectively implemented in a neural network structure

Background

Development (front-end) On account set-up, user types large amounts of text On subsequent log-ins, user types smaller amount of text Username and password are still needed

Development (back-end) Set-up data is used to train a neural network The node weights are tweaked thousands of times to train the neural network to output the desired result Log-in data will be fed through neural network: result either meets threshold (admitted) or does not meet (rejected)

Experimentation Step 1: Collected lots of test typing data via an online applet www.lukeknepper.com/research.html

Experimentation Step 2: Use this data to test the accuracy of the neural network approach: Train a neural network for each data file collected, run every other file through that neural network, record how many breach

Experimentation Step 3: Tweak the neural network set-up and repeat step 2 to find the optimal neural network

Increased exposure (25 → 50) Results Network Type Mean Training Time % Breached (threshold of .007) Base Network 1.1 s 90.5% Increased exposure (25 → 50) 2.3 s 90.7% Increased Cycles (1000 → 2000) 2.7 s 90.9% Increasing Layers (1 → 3) 3.1 s Increasing All 7.5 s

Another Advantage What if another person jumps on the computer while you are logged in? Can continuously monitor the user's typing patterns during program use If a change is detected, system suspects an intruder and locks the user out

Demo Let’s have some fun.

Neural Network Typing Authentication TJ STAR Luke Knepper lukeknep@stanford.edu