<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span>Hi,</span></div><div>Thanks for the report, I was looking for it.<span> I read about it yesterday, it is quiet fascinating isn't it? What scared me the most about the report was this: <br></span></div><div style="margin-left: 40px;"><span>In a study we conducted over a two year<br>period in several US metropolitan areas, we found that<br>a significant fraction of the “encrypted” P25 tactical radio<br>traffic sent by federal law enforcement surveillance<br>operatives is actually sent in the clear, in spite of their<br>users’ belief that they are encrypted, and often reveals<br>such sensitive data as the names of informants in criminal<br>investigations.</span></div><div>People spend years of their lives creating and testing those algorithms but in the end, the end user completely ignores them! I believe it is the same with
TETRA systems as well, if the user decides not to activate the encryption, the whole 'security' aspect of the product is lost. <br></div><div><br></div><div>I really wonder if this can cause an outcry from the legislators in the US and Europe to enforce more strict ruling against Software Radio 'capable' products. I really hope not, but you never know,</div><div><br></div><div>BR,</div><div>/Farhad<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><font face="Arial" size="2"><hr size="1"><b><span style="font-weight:bold;">From:</span></b> Mccauley <mccauley@gmx.net><br><b><span style="font-weight: bold;">To:</span></b> tetra@lists.osmocom.org<br><b><span style="font-weight: bold;">Sent:</span></b> Friday, August 19, 2011 10:18 PM<br><b><span
style="font-weight: bold;">Subject:</span></b> Off-topic resources on digital voice radio<br></font><br><br>Hope some members of this list will find interesting this paper & source<br>code.<br><br>Recent research paper that analyzed the security features of the APCO<br>Project 25 (P25) digital two-way radio system. P25 radios are widely<br>deployed in the United States by state, local and federal agencies,<br>first responders, and other public safety organizations.<br><br><a href="http://www.usenix.org/events/sec11/tech/full_papers/Clark.pdf" target="_blank">http://www.usenix.org/events/sec11/tech/full_papers/Clark.pdf</a><br><br>Digital Speech decoder an open source software package that decodes<br>several digital speech formats: P25, ProVoice, NEXEDGE/IDAS and MOTOTRBO<br>(Based on ETSI DMR Standard of especial interested for those of us in<br>Europe given is strongly promoted as a cheap alternative to TETRA).<br><br>Also worth to mention that
supporting mbelib implement IMBE/AMBE Codec.<br><br><a href="http://wiki.radioreference.com/index.php/Digital_Speech_Decoder_" target="_blank">http://wiki.radioreference.com/index.php/Digital_Speech_Decoder_</a>(software_package)<br><br><br><br><br></div></div></blockquote></div></div></body></html>