Dtmf over rj45

[Herminio Hernandez, Jr.]

I have that book if you want to borrow it.

On Fri, Dec 1, 2017 at 12:18 PM, Carruth, Rusty <Rusty.Carruth at smartm.com>
wrote:

> Yeah, the more I think about this, the more I think it might involve using
> some ‘random’ port number on a remote server to send a packet that has
> ‘something’ in it, say digitized DTMF.  But the primary problem with this
> approach is that its security depends ENTIRELY upon obscurity – as long as
> nobody knows about it, it is ‘secure’.  However, as soon as someone ELSE
> knows about it…  oops.
>
>
>
> Go grab the white book “UNIX Network Programming” by W. Richard Stevens
> and you can write both ends in a relatively short time, other than perhaps
> the digitizing and decoding part.
>
>
>
> *From:* PLUG-discuss [mailto:plug-discuss-bounces at lists.phxlinux.org] *On
> Behalf Of *Eric Oyen
> *Sent:* Friday, December 01, 2017 11:52 AM
> *To:* Main PLUG discussion list
> *Subject:* Re: Dtmf over rj45
>
>
>
> the kernel of truth is that you can use cat-x cable to do this, but any
> ethernet switches in the line will either interrupt completely or filter
> out the extraneous data as noise. In either case, your "out of band"
> transmissions will be eaten by the first switch they come across.
>
>
>
> -eric
>
> from the central offices of the Technomage Guild, the "you can't get from
> here to there" dept.
>
>
>
> On Dec 1, 2017, at 8:09 AM, Aaron Jones wrote:
>
>
>
> Not sure myself honestly. The guy was using buzz words like “out of band
> transmission” and claiming they could use dtmf and the intel me to send
> “untraceable” data without the use of IP.
>
>
>
> I am trying to be objective about it but it seems like it wouldn’t be an
> effective method of getting data out of a network.
>
>
>
> So potentially there is a kernel (heh) of truth in there. Who knows right
> now I guess.
>
>
>
> Thanks,
>
> Aaron
>
>
> On Dec 1, 2017, at 7:38 AM, Herminio Hernandez Jr. <
> herminio.hernandezjr at gmail.com> wrote:
>
> Steve is right you can use RJ45 to transmit. The signal but Ethernet
> switch are expecting Ethernet frames.
>
> Sent from my iPhone
>
>
> On Dec 1, 2017, at 7:18 AM, Stephen Partington <cryptworks at gmail.com>
> wrote:
>
> Are you talking about embedding this sort of functional noise into a line
> being used by ethernet? and yes most quality switches would try to clean up
> the noise in order to secure the data unless it just created enough of an
> interruption to just disrupt the connection as a whole.
>
>
>
> RJ45 is a socket type so you can wire it to do whatever you want. you can
> use cat 4,5,6 cable to transport anything you want. I know multiple sites
> that wired ethernet cable for POTS just because it gave them the ability to
> do a number of things based on need.
>
>
>
> On Fri, Dec 1, 2017 at 6:41 AM, Aaron Jones <retro64xyz at gmail.com> wrote:
>
> Any one have any experience with dtmf (beeps and boops over phone) but
> using rj45 instead of rj11?
>
> I viewed a claim that the intel me can produce dtmf instructions that will
> be regarded as noise by tools like wireshark and can be used to transfer
> things like encryption keys surreptitiously over the net without being seen
> by monitoring tools.
>
> Essentially data is hidden in sight as noise on the line and picked up
> somewhere else.
>
> Rj11 phone line can do this. But can it be done with rj45? Wouldn’t the
> first switch it hit just smooth noise?
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>
> --
>
> A mouse trap, placed on top of your alarm clock, will prevent you from
> rolling over and going back to sleep after you hit the snooze button.
>
> Stephen
>
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