[Asterisk-Users] Can I recreate a Fax from a recorded file?

[Josh McAllister]

Sounds like a potential business opportunity. Someone could setup a fax
proxy service that provides this sort of digital signing / archiving.
The originator could simply dial a toll-free access number, receive a
2nd dialtone and then dial the destination. Meanwhile the proxy is
recording the call, then decoding and allowing the archives to be viewed
online along with all relevent call details.

Hmm... Interesting.

Josh McAllister

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Colin
Anderson
Sent: Thursday, May 04, 2006 1:12 PM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: RE: [Asterisk-Users] Can I recreate a Fax from a recorded file?

>Why is this hard to fake at all?  You send a different fax to your 
>system, and replace the Asterisk audio file with the one from the 
>altered fax.  Additionally, the client has no realistic way of 
>verifying the correctness of your audio-to-fax translation tool; it 
>could just as easily output a TIFF file completely different from the 
>one that was actually faxed.

That's interesting, I hadn't thought of it that way. I was thinking in
terms of subtly modifying the original audio stream not outright
replacing the recording and faking the datestamp! Given that,
essentially recording the audio is the *same* as retaining the TIFF in
terms of integrity vulnerability. 

How about this: (theoretical of course)

1. Fax comes in
2. Audio is recorded
3. A checksum of the audio is generated then relayed somehow to a
seperate, secure system 4. In the event of a dispute, the checksum is
retrieved, compared with the original audio file, then the original
audio is "replayed" and the fax is regenerated.

The 3. part I leave as an exercise for the reader.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --

Asterisk-Users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users