Information technology security experts at Germany’s Ruhr-Universitat Bochum (RUB) and Max Planck Institute for Security and Privacy, and George Washington University assessing personal identification numbers (PIN) codes for securing Apple and Android cellphones found that six-digit PINs offer little more security than four-digit PINs.
RUB's Philipp Markert said although a four-digit PIN can be used to create 10,000 different combinations and a six-digit PIN can be used to create 1 million, users prefer simple combinations that often fail to exploit six-digit PINs' full potential.
The study also concluded that four and six-digit PINs are less secure than passwords, but more secure than pattern locks.
From Ruhr-University Bochum (Germany)
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