Various means of identity authentication, such as signatures, personal identificationnumbers (PINs) and passports have been used to ensure security and control access to buildings, financial accounts, electronic devices and many other aspects of everyday life. Now though, the need for faster, more convenient and accurate identity authentication and identification has never been so great. Constant mobile connectivity, the ubiquity of the Internet, the growing popularity of e-commerce and many other factors all accentuate how critical and difficult it can be to authenticate someone’s identity.
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