RE: identifying images in a binary

[Omar Herrera <oherrera () prodigy net mx>]

Hi,

Try using file header extensions
(http://www.garykessler.net/library/file_sigs.html) + regular expressions
(e.g. grep). That might do the trick.

Note however that many fingerprint devices don't work with complete images
of fingerprints but rather with minutiae data obtained from on-device
processing of the image. Therefore, you might never see an image of a
fingerprint being transferred from the device but something like a hash of
the minutiae.

Also, many vendors use proprietary file formats to save/and transfer data.
If your device complies with some standards might want to check them first
(e.g. NIST's CBEFF).

Hope this helps,

Omar Herrera

> -----Original Message-----
> From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
>
> I'm currently looking at a usb fingerprint reader and I'm needing some
> tools for identifying media (images) from a binary stream.
>
> I'd like to run a tool against a usb dump and identify any fingerprint
> images (ie. pgm format, etc)


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