How will HSBC's new voice biometrics work?

Professor Angela Sasse (UCL Computer Science) explains how voice biometrics work by comparing the complex signature prints generated when we speak. Listen: BBC Radio 2 'Jeremy Vine' (from 36 mins), More: BBC Radio Somerset 'Ben McGrail' (from 1 hour 48 mins), BBC Radio Stoke 'Perry Spiller' (from 1 hour 47 mins), BBC Radio Leicester 'Jonathan Lampon' (from 1 hour 51 mins), BBC Radio Leeds 'Martin Kelner' (from 41 mins 38 secs)