[Code-Crunchers] identifying images in a binary (fwd)

[Carlos Pizano]

I don't expect the usb stream to contain the image in any standard
format such as bmp or gif or whatever, in fact for a fingerprint reader
the logical choice would be to send the raw values: 

[number of rows]...[pixels per row]..[bytes per-pixel]...[row 0][row 1]

Where '...' would be any random-looking stuff. Of course maybe if the
device only supports one resolution then there would be no point to send
anything but the rows.

I think best would be to diff two fingerprint captures, with the same
parameters and hope that the format will become obvious.

CPU


-----Original Message-----
From: Gadi Evron [mailto:ge at linuxbox.org] 
Sent: Friday, November 24, 2006 3:46 AM
To: code-crunchers at whitestar.linuxbox.org
Subject: Re: [Code-Crunchers] identifying images in a binary (fwd)



---------- Forwarded message ----------
Date: Wed, 22 Nov 2006 08:51:23 +0100
From: Greg Leclercq <ggregl at gmail.com>
To: offset <offset at ubersecurity.org>
Cc: pen-test at securityfocus.com
Subject: Re: identifying images in a binary
Resent-Date: Fri, 24 Nov 2006 00:45:11 -0700 (MST)
Resent-From: pen-test-return-1078483017 at securityfocus.com

On 11/21/06, offset <offset at ubersecurity.org> wrote:

Hi offset,

> 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)

Hachoir [ http://hachoir.org/ ] may help you.

Cheers,
-- 
.::[ Greg ]::.

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