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DMR 40 bit encryption

Posted: Sat Nov 18, 2017 5:53 pm
by Max
Since the Enhanced Privacy 40 bit encryption in any XPR 4550,5550 is hackable , does using RAS add any extra layer of security from eavesdropping ?


MAX

Re: DMR 40 bit encryption

Posted: Sat Nov 18, 2017 6:38 pm
by RFguy
My understanding is RAS does not add any additional level of encryption, just limits access to a repeater.

Re: DMR 40 bit encryption

Posted: Fri Nov 24, 2017 11:30 am
by motorola_otaku
Max wrote:Since the Enhanced Privacy 40 bit encryption in any XPR 4550,5550 is hackable...

Source? Enhanced Privacy is the at the same level as ADP in the P25 world, and if it had been openly compromised there would have been a huge uproar.

Re: DMR 40 bit encryption

Posted: Fri Nov 24, 2017 11:32 am
by Max
Well, it has been compromised and i have the proof.

Re: DMR 40 bit encryption

Posted: Fri Nov 24, 2017 6:41 pm
by W3AXL
ADP is easy enough to crack due to the fact that the end of every P25 transmission contains known silence packets. There was a paper I read somewhere that detailed one group's efforts to crack ADP keys using captured P25 frames and it took them only a couple of days at most.

Here's the info on the paper, but for whatever reason it's restricted to paid access only. I definitely remember reading a free PDF of this paper somewhere. Oh well.
https://publications.csiro.au/rpr/pub?pid=nicta:5076

EDIT: Here's another similar presentation on the subject.
http://2011.ruxcon.org.au/assets/Presentations/2011-2/RUXCON_2011_slides.pdf

Bottom line is that ADP isn't very secure at all. I'm not too familiar with the TRBO encryption side of things, but there's a good chance a similar weakness exists in that department as well.

Re: DMR 40 bit encryption

Posted: Mon Nov 27, 2017 3:37 pm
by motorola_otaku
Those papers are 6 years old and only deal in hypotheticals, which is a whole other ballgame than openly compromised and decryptable in real time as OP claims.

Re: DMR 40 bit encryption

Posted: Tue Nov 28, 2017 11:21 am
by escomm
Max wrote:Well, it has been compromised and i have the proof.

Based on your posts in the trbo forums I'm gonna submit your credibility is suspect at best. Post the proof or stop talking about

Re: DMR 40 bit encryption

Posted: Tue Nov 28, 2017 11:27 am
by Max
removed