The database (using PostgreSQL) is comprised of three tables and five experimental scenarios. This document will describe the dataset, database, and how to use it.

You can find the dataset here: https://drive.google.com/open?id=1trBm0BcdzZvYearEVcPB-UdQ797Tf_Pb

Our dataset includes the sensor data for the following experimental scenarios (please refer to the paper for further details):

• Baseline Experiments
  • E1: The scenario in which users copied the same content.
  • E2: Users copied unique content from one another and across sessions.
  • E3: Emulating a freewriting scenario in which users experience a higher cognitive load, this experiment had users answer essay-style questions.
• Attack Experiments
  • E4: Attackers are given copies of their target's handwriting to practice against.
  • E5: Each attacker viewed the video footage of their target's wrist and hand during the writing process.

This section describes the different tables included in our database and what the possible values mean.

TABLE baseline_experiments (
    user_session_id TEXT PRIMARY KEY,
    user_id BIGINT NOT NULL,
    session BIGINT NOT NULL,
    scenario BIGINT NOT NULL
)

Definitions:

• user_session_id: user_id + session + scenario.
• user_id: the anonymized ID of the user.
• session: 1 or 0, depending on if this was the training session.
• scenario: 1 (E1), 2 (E2), or 3 (E3) depending on which scenario the data is from.

TABLE impostor_experiments (
    user_session_id TEXT PRIMARY KEY,
    target_user BIGINT NOT NULL,
    attacking_user BIGINT NOT NULL,
    experiment BIGINT NOT NULL
    attack BIGINT NOT NULL
)

Definitions:

• user_session_id: attacking_user + target_user + experiment + attack
• target_user: the anonymized ID of the user.
• attacking_user: the anonymized ID of the attacker.
• experiment: 1 (E1), 2 (E2), or 3 (E3) depending on which scenario the training data is from.
• attack: 4 (E4) or 5 (E5) depending on which attack method was used for this particular set of data.

TABLE handwriting_data (
    timestamp TEXT NOT NULL,
    x DOUBLE PRECISION NOT NULL,
    y DOUBLE PRECISION NOT NULL,
    z DOUBLE PRECISION NOT NULL,
    user_session_id TEXT NOT NULL,
    index BIGINT NOT NULL,
    PRIMARY KEY(user_session_id, index)
)

Definitions:

• timestamp: The datetime difference between the start and end of the session.
• x: the x component of the linear acceleration sensor data.
• y: the y component of the linear acceleration sensor data.
• z: the z component of the linear acceleration sensor data.
• user_session_id: user_session_id from either the baseline or impostor experiment table.
• index: the index of the data in a given csv file.

The dataset was exported with pgAdmin and can be imported with the psql command.

psql -U your_user_name your_db_name < dataset.sql