Fingerprint-Protected USB Sticks Cracked

juct writes "Manufacturers of USB sticks and cards with fingerprint readers promise us that their data safes can only be opened with the right fingerprint. In their tests, heise Security found that it is easy to bypass the authentication and get access to the protected data. This works by sending a single USB command, using the open source tool PLscsi, that changes the accessible partition. They found the vulnerability in several USB sticks that use the same chipset. The article concludes: 'The fingerprint sensors in the products mentioned above apparently only serve one purpose: they mislead interested buyers. They do not provide any significant level of protection. We can only recommend that these products not be purchased.'"

Comments

Re:Fingerprint scanners suck.

[u8i9o0]

But no two scans of one fingerprint are identical pixel for pixel. If you scan one thumb ten times, you get ten different hashes.

Then that's not the way it should be done. For one thing, while the angle of the print may change, the relative size will not.

I think you can create fingerprints based off of a formula. All you need is to supply a set of variable coefficients. The hash would be that set of coefficients for your formula.

It's been a very long time since I had studied fingerprints, and that was rather cursory.

From what I know, every print has at least one point. The alternative is that some prints have ridges going straight across, which doesn't sound right to me.

- Focus on the most prominent one or the one ranked highest in priority.
- Measure the distances between unique points and their angles relative to each other.
- A left loop will always be a left loop no matter the rotation, and has an apex.
- Same with a tented arch, except it will also have a triangular shape.
- A whorl has two epicenters of a given distance.

I never worked in the field, but the above plan seems obvious to me. I also don't have a large sample set to help refine that formula - maybe having two whorls or two similar loops or some other combo never happens.

With any authentication, the important thing is that it be easy to produce the key and make it very hard to fake it. Therefore, the biggest problem with fingerprint authentication is that the user keeps leaving their key everywhere they touch. It's like mentioning your passwords in plaintext within every conversation you have. One solution may be to use toeprints instead.