hi everybody,

i've to write sth about voice based authentication service and i'm still looking for disadvantages..i'vealreayd found :

-easily duplicated with tape and other recorders
-voiceprints can vary over the course of the day, and one’s health, such as cold or laryngitis, can affect verification of the user by the system
-misspoken and background noises can interfere with the system

but i' searching for more!!
has anybody a good site or other hint??

i looked google and rr.sans.org and other relevant sites but i'd like to get more infos!

thanks for the help!!

cheers,