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

[Steve Underwood]

Alejandro Vargas wrote:

> 2006/5/5, Steve Underwood <steveu at coppice.org>:
>
>> In most cases, forensic analysis of the audio from another machine would
>> easily show it was a fake. It would lack tell-tale fingerprints of the
>> true path, unless it was done with extreme care. Certainly using exactly
>> the same model of FAX machine that sent the genuine FAX would be a must.
>> Not just for the vendor information it sends, but for the fine details
>> in how its modems behave. To pass of the altered fax as being from the
>> original sender would require careful control of the DSP.
>
>
> People must realize that fax is not a secure method to send
> information. There are protocols created to solve the legal problems,
> that uses digital signs, standard formats, and relies in a 3d party
> entity that certificates that the info was sent, recived and red,
> logging the exact times. These methods are actually used by many
> busines to send price listings, budgets, buy orders, invoices, bank
> money transfers, etc. all automatcaly and electronicaly. A stock
> system can detect a low count of some products, it sends price-listing
> request to the providers and waits for the answers, someone with
> authorities chooses the prefered one or request a bettre price. Then
> orders the system to buy the products. The provider system receives
> the request electronically, prepares the shipping, sends the invoice
> electronically, etc. etc. All automatic and all legal.
>
> Faxes are not the right way to do legal and reliable document
> transfers. It is only a quick and unreliable way to show a document to
> someone instead of dictating it by phone.

FAXes *are* accepted for many legal things. It is one of the things 
keeping FAX from dying completely. They are completely forgable, yet 
accepted. Before them telex ket going long after its sell by date 
because a telex was acceptable in court. They were far more forgable 
than FAX. An old boss if mine has to show telexes were forged as an 
expert witness. The only reason he could do this is because people are 
sloppy, and didn't get the spacing exactly like a real telex would have.

Steve