A secure electronic lock can be designed using an array of linear magnetic sensors configured to detect a magnetic pattern. If a strong external magnet were brought in proximity to the array, it would be read as a random attempt and could trigger an alarm. Honeywell’s Linear Hall-Effect Sensor ICs may be used to unlock the system only if the magnetic field read by each sensor is of the correct polarity and within acceptable amplitude limits. Without reproducing the exact magnetic flux pattern, it would be virtually impossible to unlock the system with a single, or even multiple, strong magnets. Honeywell’s Linear Hall-Effect Sensor ICs provide sensitivity, output, and very small size.