Biometric Spyware
Wednesday, February 11th, 2009I know what your thinking. Your thinking “you know, soon we won’t need passwords. We will just scan a fingerprint or something.” I am here to tell you that this is most likely naive. I don’t want to rain on anyone’s parade but there are some big problems combining biometrics and the internet. Big problems. I’m not talking about the current finger scanner solution found on your state-of-the-art laptop. That is a locally stored biometric secret used to manage your identity on your laptop. That is not so bad. I am talking about large, centralized databases of biometric secrets. I am talking about a system where I can use your finger scanner to access my files over the internet.
If a biometric identifier is a value computed strictly from physical trait(s) then THAT VALUE IS STATIC. Fingerprint, palm, footprint, retina, dna. It doesn’t matter. Any one of them. Any two of them. All of them combined. They all add up to one large string of characters that never changes. All you need to know is this. If your biometric value is obtained by some stranger AND that stranger can feed your value into the authorization channel then guess what… Your identity is compromised for the life of the system. It is not my intention to slight biometric efforts. But think about what the current solution would be. The internet is currently susceptible to spyware. Slap a biometric device on the front. The internet is still susceptible to spyware. Only now its worse. The internet becomes susceptible to biometric spyware.
I know there is research being done on something called irrevocable biometrics. This is the study of biometric secrets that can change value. IBM is currently conducting research on irrevocable biometrics. The IBM paper is a complicated read. Good luck to those gentlemen. I am unable to follow the math. But I do follow the logic in their charts. I still see vulnerability with spyware immediately after the biometric feature has been scanned.
Which brings us back full circle to the password. Biometrics are derivations of the body. Passwords are derivations of the mind. One of them can be changed easily. I suggest using both to best emulate identity.

