Dtmf over rj45

[Carruth, Rusty]

Or check the library.  I have a copy too, but keep it handy for those cold nights when I need to go write some code ;-)


From: PLUG-discuss [mailto:plug-discuss-bounces at lists.phxlinux.org] On Behalf Of Herminio Hernandez, Jr.
Sent: Friday, December 01, 2017 12:38 PM
To: Main PLUG discussion list
Subject: Re: Dtmf over rj45

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<mailto: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<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<mailto: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<mailto: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<mailto: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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