DSD-FME not showing encryption details and AMBE frames

[dolman]

Might be a silly question, but I’m monitoring a few DMR frequencies in my area. They’re all encrypted, so I can’t decode the voice, but I’m trying to gather as much info about them as possible. I’m using DSD-FME with the -Z option to figure out encryption algorithm, it shows it just fine:

Slot 1 DMR PI H- ALG ID: 0x21 KEY ID: 0x03 MI: 0x1BA6129B[0m
[36m DMR PDU Payload [21][10][03][1B][A6][1D][B9][00][00][03][5C][2D][0m
13:05:24 Sync: +DMR   slot1  [slot2] | Color Code=01 | IDLE
[33m Activity Update TS1: Group Voice; Hash: 9; TS2: Idle; Hash: 0;
 SLCO Completed Block [18][00][90][0A][00]
[0m
13:05:24 Sync: +DMR  [SLOT1]  slot2  | Color Code=01 | VC1*
 AMBE 0BD6F009CF1780 err = [0] [0]
 AMBE BC83A6FAD55500 err = [0] [0]
 AMBE F480F302AB4080 err = [0] [0]

However, there are a few frequencies with pretty strong signal where I don’t see encryption details or AMBE frames in the log:

22:05:31 Sync: +DMR   slot1  [slot2] | Color Code=11 | TLC [31m
 SLOT 2 TGT=200 SRC=59028 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][C8][00][E6][94][1E][AA][8E][0m
22:05:31 Sync: +DMR  [slot1]  slot2  | Color Code=11 | IDLE
22:05:31 Sync: +DMR   slot1  [slot2] | Color Code=11 | TLC [31m
 SLOT 2 TGT=200 SRC=59028 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][C8][00][E6][94][1E][AA][8E][0m
22:05:31 Sync: +DMR  [slot1]  slot2  | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 118;
 SLCO Completed Block [10][80][07][60][20]

Any idea why DSD-FME wouldn’t show this information on those frequencies?

 

[lwvmobile]

My Spider Senses are tingling.

Create a sample of the latter and I'll examine it. -c dmr_capture.bin, capture some traffic that fits the description you give, compress it as a zip file and attach it.

 

[dolman]

I’ve sent you a private message with the captured samples.

 

[dolman]

Mystery solved – DSD-FME doesn’t show the PI header or Encryption Identifiers because those transmissions are secured with simple Motorola BP keys. Thread may be closed.

 

[dolman]

Hello again Iwmobile,

Hope you don’t mind me picking your brain once more. I’ve come across a slightly odd DMR system nearby and was hoping to get your thoughts. There are four frequencies, all transmitting the same DMR traffic in parallel, perfectly time-synced, so I’m guessing it’s an IP Site system. The traffic’s minimal, and when I managed to catch a bit on one of the frequencies, DSDPlus didn’t show any AMBE frames.

Would you mind having a quick look at the log below? Just wondering how I should interpret this. I have used the following options to run DSDPlus: -fs -Z -N 2>/home/log.txt

SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m SLCO NULL [0m
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:55 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:55 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | VLC [32m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][EC][3C][C5][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:56 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:56 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]
[0m
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
20:11:57 Sync: +DMR slot1 [slot2] | Color Code=11 | TLC [31m
SLOT 2 TGT=205 SRC=56543 FLCO=0x00 FID=0x10 SVC=0x40 Group [31mEncrypted Call [0m
[36m DMR PDU Payload [00][10][40][00][00][CD][00][DC][DF][E3][33][CA][0m
20:11:57 Sync: +DMR [slot1] slot2 | Color Code=11 | IDLE
[33m Activity Update TS1: Idle; Hash: 0; TS2: Group Voice; Hash: 109;
SLCO Completed Block [10][80][06][D4][30]

 

[lwvmobile]

Not sure, but considering its just a bunch of link control headers (VLC) followed by a bunch of link control termination headers (TLC) with no actual voice in-between, I'd consider it that somebody accidentally or intentionally hit the PTT for a split second and hung up, or their battery is dead. Just a guess.