利用手機螢幕上的餘熱分析可能的 PIN 碼：「Heat traces left by fingers can reveal your smartphone PIN」，在輸入完 PIN 碼的 30 秒內的準確度都還是很高 (80%)： The report further revealed that if the thermal image is collected within 15 seconds of a PIN being entered, the technique is accurate almost 90% of the time. At 30 seconds, this accuracy decreased slightly to 80%. At 45 seconds or more, the accuracy dropped to 35% and below.