Biometric security systems that rely on fingerprint recognition
have always had an easily exploited weakness in that they can be
fooled by anything bearing a copy of the expected fingerprint.
Now, a new development from Japan eliminates that flaw.  NTT's
breakthrough allows fingerprint sensors to determine whether or
not they are in contact with a real human finger by passing
electricity across two electrodes [Subscription link].  Plastic
fingers rejected  The conductivity of a flesh and blood digit is
easily recognised and can be distinguished from a plastic copy
that contains the same fingerprint pattern.  NTT plans to add
the relatively simple technology to its sensors with a view to
regaining some of the market share lost to finger- and palm-vein
readers over the last couple of years.  In Japan, many bank ATMs
use a biometric scanner to verify account holders' identity,
which goes a long way to creating a market that will be worth
around ¥40 billion (£200 million) there in 2010.