#raw data set was taken from https://ieee-dataport.org/open-access/su-ais-bb-mas-syracuse-university-and-assured-information-security-behavioral-biometrics

Keystrokes RL

Environment setup

Tested on Ubuntu 20.04 but following should work on all major platforms.

# Create a virtual environment
$ python3 -m venv venv

$ source venv/bin/activate
# venv\Scripts\activate (in Windows)

# Install all requirements
$ pip install -r requiements.txt

Run examples

Full dataset

$ python main.py --dataset-path dataset/full_bbmas_dataset/ --mode train --exp-name "demoexp" $ python main.py --dataset-path dataset/full_bbmas_dataset/ --mode test --exp-name "demoexp"

Individual users

• Train model (learn patterns) for user_id 16

  $ python main.py --dataset-path dataset/full_bbmas_dataset/  --user 11 --mode train --exp-name "demoexp"
  

• Test model for user_id 11 (if you find out any user is not performing well test that user again to improve results)

  $ python main.py --dataset-path dataset/full_bbmas_dataset/  --user 11 --mode test --exp-name "demoexp"
  

Configuration

Setup following key parameters in the config.json file:

• No - Number of events in an observation
• Nh - Number of events to hop to move to next observation
• num_encoder_features - Number of output features after encoding feature vector
• corrupt_bad_probability - Probability of corrupting a given sample
• num_episodes - Number of episodes to train the model
• c_update - Number of episodes after which agent (DDQN) updates its target net
• eps_start - Initial exploration probability
• eps_end - End exploration probability
• eps_decay - Decay rate of exploration probability

Major TODOs

• Better corruption technique

Future work

• Summary features
• Augmentation in training

Discussion

• Language model
• Time Warping: Simulating variable typing speed by stretching or shrinking the time intervals between key presses.
• Jittering: Adding random variations to the timing of key presses to simulate different typing habits.
• Key Swap: Interchanging the keys pressed during a typing sequence to simulate different typing patterns.
• Key Insertion/Deletion: Adding or removing key presses in a sequence to simulate typing errors or variations in typing speed.