Though security applications that verify a person’s identity based on their physical attributes, such as fingerprint readers or iris scanners, have been in use for some time, biometric security has only recently started to appear in mobile phones, PDAs and notebook computers where the need for miniaturisation represents a technological challenge.

So far biometric data has been used to tie the device to a person to prevent it from being used illegitimately if lost or stolen. But the IST project SecurePhone is taking a new approach, employing physical attributes to enable the user to digitally sign audio, text or image files, providing proof of their origin and authenticity.

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