Shoulder surfing is looking over someones shoulder when they enter a password or a PIN code. Variations of shoulder surfing include:
- Using binoculars or a low-power telescope to view someone entering a PIN code.
- Coating the key pad with a thin coating of ultraviolet material so that you can later see which keys the user pressed.
- Listening to the a user type in their password to determine how many keystrokes they type, and therefore how many characters their password is.
- Listening to a user dial a PIN on a telephone keypad and determining the PIN code from the sound of the DTMF tones.
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