A computerized user authentication method that utilizes a digital drawing created by a user and the Cartesian Coordinate System to verify the user's identity. The method utilizes a software-driven stopwatch integrated into a computing device to measure time, establish a time baseline, and control the scanning expanse of a digital drawing. To verify the identity of the user, the acquired X Axis and Y Axis values that represent the scanned segment of the digital drawing, which were previously correlated to the user, are used as part of his/her authentication credentials to obtain access to computer information systems and portable computing devices. Since the authentication process requires the user to stop the stopwatch within the user-assigned time range, the clocked time value is also used to identify the user. Admissible time and axis values are stored in a database for comparison during the user authentication process.