The research team also included Ruhr University's Philipp Markert. In addition, entering such a code to unlock the display took 5 seconds on average, compared to entering a PIN which typically takes 4.5 seconds and an Android unlock pattern needing only 3 seconds. Approximately one in ten participants forgot their code by the end of the study, even though it lasted only five minutes. The study showed that knock codes are difficult to memorize. The researchers said there should be a feature that blocks codes which are too easy to guess and advises users to pick stronger ones, similar to how some websites respond when users create password-protected accounts.
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