把 side-channel information 配合上統計方法就可以達到 74% 的正確率：「Phone Hack Uses Sensors To Steal PINs」。
而且當可以多抓到更多資訊時 (像是第二次輸入) 準確度就更高了：
Using a sample set of 50 PINs, researchers found that their script was able to correctly guess a user’s PIN 74 percent of the time on the first try, which increases to 86 and 94 percent success rates on the second and third attempts.
有些瀏覽器有做一些修正，讓 side-channel information 變少，於是難度變高：
As for Google, it’s unclear what measures have been taken. “Our concern is confirmed by members in the Google Chromium team, who also believe that the issue remains unresolved,” the report stated. Google did not reply to a request to comment for this report.