Why you shouldn't trust biometric security systems...

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Preacherman

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From Security Focus (http://www.securityfocus.com/news/10817):

Carjackers swipe biometric Merc, plus owner's finger

By John Leyden, The Register
Apr 4 2005 8:33AM

A Malaysian businessman has lost a finger to car thieves impatient to get around his Mercedes' fingerprint security system. Accountant K Kumaran, the BBC reports, had at first been forced to start the S-class Merc, but when the carjackers wanted to start it again without having him along, they chopped off the end of his index finger with a machete.

Although security systems of this sort are typically fitted to high end cars (because of import duties, Kumaran's car is reported to have been worth $75,000 "second-hand" - under the circumstances, we think we'd have said 'at resale'), they're not in essence particularly high tech or high security. As is the case with most auto security systems, they're mainly a speed bump intended to make it sufficiently hard for the would-be thief to encourage them to look elsewhere for victims. The fingerprint readers themselves will, like similar devices aimed at the computer or electronic device markets, have a fairly broad tolerance, on the basis that products that stop people using their own cars, computers or whatever because their fingers are a bit sweaty won't turn out to be very popular.

They slow thieves up a tad, many people will find them more convenient than passwords or pin numbers, and as they're apparently 'cutting edge' and biometric technology is allegedly 'foolproof', they allow their owners to swank around in a false aura of high tech. Get the secured object on its own for a little while and you can usually chop the security off fairly easily, but as the evidence now shows the more determined and impatient class of thief might just chop off your finger as a temporary measure.

Clearly we need to think carefully about how we see security here. If you're held at knife point at the cash machine and your assailant demands your pin number, then you will understand there may be consequences to refusing. Whether or not you do will depend on numerous of factors, but it is likely that most people will under certain conditions decide it's sensible to give in. You could see this as meaning that a pin number is inadequate as a security device, and that something else, backed, say, by biometrics, would be better. Which is pretty much what many of our leaders, including our own, which has specifically commended the efficacy of ID card-backed security for financial transactions, have been recommending.

But as the S-class Merc with security too irritating for the good of its owners health has shown, it's a lot more complicated than that. You don't want situations where a severed finger or arm can be used in unsupervised situations in their owner's absence. You could consider more sophisticated systems which used more complex biometrics and performed some form of check to make sure the owner was still attached and breathing, but even then you shouldn't view this as 100 per cent perfect.

If, for example, it's a case of ruthless gangsters trying to steal an extremely valuable motor car, then they'll quite probably take you along for a ride down to the bent auto shop they use, then kill you. Or if the security is so frustratingly good that the drug-crazed psycho can't even get a cashpoint withdrawal out of the deal, they might just stab you.

The UK's Association of Chief Police Officers (ACPO) incidentally extolled the virtues of biometric security in its evidence for the Parliamentary Transport Committee's Cars of the Future enquiry, and while the Home Office hasn't put forward biometric credit card validation as an immediate gain for the ID card scheme, this is certainly on its roadmaps.

But they should consider the implications before they get into that kind of territory, and understand that in most cases there will come a point where you actually want the owner to be able to disable the security quickly and easily. At minimum, biometrically-locked motor vehicles should surely kick up a 'Disable fingerprint security? Y/N') dialogue whenever you stick your finger into them.
 
Many quality biometric systems won't be fooled by the disembodied finger; they have heat sensors in them. Unless the person puts the finger into a warming device, it won't get them anywhere.
 
Many quality biometric systems won't be fooled by the disembodied finger; they have heat sensors in them. Unless the person puts the finger into a warming device, it won't get them anywhere.
Oh, that makes me feel better. :rolleyes:
 
Yeah, it is a small consolation. My father works in information security R&D for a major financial institution, so he gets to play with these toys. In his case, such a feature is a real protection. Most of us would rather keep our fingers; we don't have access to that kind of stuff anyway.
 
This is not a new occurence.

Not so long ago, thieves in some SE Asian countries were known to do the same thing when they saw a rich tourist (for example) with a ring on his/her finger.
Walk up with bolt cutters, and take the ring and finger. :uhoh:

Convincing argument to not wear jewelry in countries like that.
 
Bruce Schneier wrote this piece about researcher Tsutomu Matsumoto fooling fingerprint recognition systems with household supplies, making replica fingers out of gelatin and a cast of a real finger. Or, better yet, from a latent print.

Fun with Fingerprint Readers

Sensing warmth to tell whether a finger is alive? Put your replica finger in your pocket before using it. Or, make it thin enough to fit over your real finger. No brainer.
 
With simple circuits it is easy to bypass built in security features.

Something like that Mercedes would require a little more work.

That means you might actually have to build your own bypass device before stealing the vehicle.

Either way, not that hard to defeat that stuff, all it does at best is to give the owner/security guard a chance to catch the thief.

Still comes down to a person with a gun having to settle things...
 
BTW, M-B is now dealing with a recall of 1.3 million cars because of faulty electronic systems !!! So you want gadgets ? There are also stores in Germany where you can pay by just using your finger ,after you have registered of course.
 
Bruce Schneier wrote this piece about researcher Tsutomu Matsumoto fooling fingerprint recognition systems with household supplies, making replica fingers out of gelatin and a cast of a real finger. Or, better yet, from a latent print.

Fun with Fingerprint Readers

Sensing warmth to tell whether a finger is alive? Put your replica finger in your pocket before using it. Or, make it thin enough to fit over your real finger. No brainer.

Doesn't sound like something your average street punk or house burglar is going to do. Maybe if you're part of Ocean's Eleven....but otherwise there are plenty of day-to-day applications where biometric systems are useful and convenient. There's no such thing as foolproof security. If you build a better mousetrap, someone will find a way around it.

I guess I'm lucky -- I'll never have anything that anybody else would ever go to the trouble of making a gelatin mold of my finger, complete with warmth and fingerprints, to steal!

Jim
 
I guess I'm lucky -- I'll never have anything that anybody else would ever go to the trouble of making a gelatin mold of my finger, complete with warmth and fingerprints, to steal!
Yeah ;)

There's an advantage to buying 10+ year old vehicles, besides not paying for all that depreciation, interest rates, full coverage insurance, and exhorbitant license plate costs. Who would bother breaking into or stealing it? :)
 
I read an article that said the good retina scanners check to make sure the blood vessels on the surface of the eye are pulsating (with a heartbeat), so you cant just snatch an eye to gain access.

Kharn
 
I read an article that said the good retina scanners check to make sure the blood vessels on the surface of the eye are pulsating (with a heartbeat), so you cant just snatch an eye to gain access.
Better hope the crooks know that

otherwise, they might be back looking for the one-eyed guy :uhoh:
 
Navy87Guy,


Some fingerprint scanners have been fooled by pressing a gummi bear against them.


Biometrics are not, and will (probably) never be, the ideal way to identify one's self to a computer. They have some serious drawbacks:

1. They are not secret. Unless you wear gloves all day, and dispose of them safely after you get home, anyone can get a copy of your fingerprint. With a really nice camera, and a really nice zoom, and appropriate lenses, you could get someone's retina. If it's facial recognition, a picture of your face may do. If it's not a secret, it can be duplicated.

2. They cannot be replaced. If someone steals your credit card, or figures out your password, you can change it pretty easily. What happens when someone copies your fingerprint? You've got nine fingers and ten toes, left. What about your retina? You've only got two of those.

3. They fail catostrophically to catastrophic problems. If my credit card falls into the combine, I can get a new one. If my hands fall into the combine, I have no fingerprints left. If I'm in a terrible accident and lose my eyes, I have no retina.


Biometrics fail in too many ways to use them as a primary form of authentication.

That said, we use biometrics every day when trying to identify each other. For example, when I walk up to my friend, he recognizes my build, features, style of dress, gait, voice, etc. It's very hard to fool a person, but machines are nowhere near as good as humans for this.
 
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