No official standard yet - at least as far as deployment goes.P25 Link Level Encryption
One of well known security flaws (if you'll call it that) is the ability to monitor talkgroup/user IDs even on encrypted systems. As the article quoted states, Link Level Encryption is in the works. (http://www.project25.org/images/stories/ptig/P25_Standards_Updates/TR8_2016_summary_6.09.16.pdf)...forums.radioreference.com
Perhaps it is not in its final configuration.Here's what likely Paris Mt is doing right now. First is direct input which sounds different than it should, second is in control channel 'on' search mode where it does not display sysid and site like it should.
No official standard yet - at least as far as deployment goes.
What systems currently use LLE? The brand new systems around here - and there are *a lot* - did not deploy it.P25 Link Level Encryption is a standard and has been deployed on systems. However it does not at this time encrypt the control channel. In these cases it provides an encrypted key that the radio must send before the system allows it to register/affiliate on the system. This helps reduce radio ID spoofing and other radio hackery.
I should have listed, I know everyone's neighbors except concerning 1.95:
1.83-1.86, 1.87
1.84-1.87, 1.89, 1.92, 1.94, 1.97, 1.98
1.85-1.88, 1.89, 1.92, 1.96
1.86-1.83, 1.87, 1.90, 1.91, 1.98
1.87-1.83, 1.84, 1.86, 1.91, 1.97, 1.98
1.88-1.85, 1.89, 1.961.90, 1.90
1.89-1.84, 1.92, 1.85, 1.88, 1.98
1.90-1.86, 1.88, 1.91, 1.93, 1.98
1.91-1.86, 1.87, 1.90, 1.91, 1.93
1.92-1.84, 1.85, 1.89, 1.94
1.93-1.90, 1.91
1.94-1.84, 1.92, 1.97, 1.99
1.95-?
1.96-1.85, 1.88
1.97-1.84, 1.87, 1.91, 1.94, 1.99
1.98-1.84, 1.86, 1.87, 1.88, 1.89, 1.90,
1.99-1.91, 1.94, 1.97
I saw no evidence of an active site in Upper Marlboro today, on any Fed VHF freq 160-174 MHz. The cch for site 1.98 was weak in Suitland, but not evident in Upper Marlboro. It registered as APCO, but could no be decoded.
Site 001-099 showed neighbor / peers sites:
1.91 Greenbelt
1.93 Jessup
1.94
1.97 Suitland
There *seemed* to be coverage testing in PG using 172.3875, and *possibly* 170.375 (weak in Rosaryville.).
Site 001-97 decoded with peers:
1.83
1.84
1.87
1.91
1.94
1.99
If UT2 is decoding a weak signal, it can produce some errors. If some data looks suspicious, I generally delete it and wait for it to be repopulated.
I'll recheck Upper Marlboro. I was checking reception using SDR# while driving through "downtown" and at the McDonald's.