DSDPlus Unknown algo type 0A

[gary123]

I was sent this capture on a P25P2 system

026/04/27 16:31:39 Freq=867.925000 NAC=CD0 Group call; TG=2 [ALGID 0A KID 1000 Radio Testing] RID=3 Ch=866.4875 3s
2026/04/27 16:34:02 Freq=867.925000 NAC=CD0 Group call; TG=2 [ALGID 0A KID 1000 Radio Testing] RID=3 Ch=866.4875 5s
2026/04/27 16:34:09 Freq=867.925000 NAC=CD0 Group call; TG=2 [ALGID 0A KID 1000 Radio Testing] RID=3 Ch=866.1875 18s

Anyone know what Algo this is? The system is also using AES(ALGID 25).

The signal is super strong and this is not a false decode.

 

[N4KVL]

ADP

 

[ki4hyf]

It looks to me like an unencrypted group call with an alias of "[ALGID 0A KID 1000 Radio Testing]".

 

[gary123]

ADP

ki4hyf hit it on the head. Its not a capture of a ALGID or KID. It is user entered description information. When I requested the full set of DSD files. I saw this in the groups.

P25, BEE00.CD8, 2, 50, Normal, 28, 2026/02/11 16:38, "ALGID 0A KID 1000 Radio Testing"

I guess never believe everything you read. Thanks everyone for clearing up this mystery.

 

[wgbecks]

ADP

ADP is 0xAA [0xAA Motorola ADP (40 bit RC4)]

 

[gary123]

Anyone ever see a P25P2 DES transmission? it would be nice to nail down the algid for that. I have never seen DVI or GSM on the air.

 

[wgbecks]

Anyone ever see a P25P2 DES transmission? it would be nice to nail down the algid for that. I have never seen DVI or GSM on the air.

DMR ALGIDs
0x01 Anytone RC4
0x21 Motorola EP/RC4
0x22 DES
0x24 AES-128
0x25 AES-156

P25 ALGIDs
0x00 ACCORDION 1.3
0x01 BATON (Auto Even)
0x02 FIREFLY Type 1
0x03 MAYFLY Type 1
0x04 SAVILLE
0x05 Motorola Assigned - PADSTONE
0x41 BATON (Auto Odd)
0x80 Unencrypted
0x81 DES-OFB 56 bit key
0x83 3 key Triple DES 168 bit key
0x84 AES-256-OFB
0x85 AES-128-ECB
0x88 AES-CBC
0x89 AES-128-OFB
0x9F Motorola DES-XL 56-bit key
0xA0 Motorola DVI-XL
0xA1 Motorola DVP-XL
0xA2 Motorola DVI-SPFL
0xA2 Motorola DVI-XL-SPFL
0xA3 Motorola HAYSTACK
0xA4 Motorola Assigned - Unknown
0xA5 Motorola Assigned - Unknown
0xA6 Motorola Assigned - Unknown
0xA7 Motorola Assigned - Unknown
0xA8 Motorola Assigned - Unknown
0xA9 Motorola Assigned - Unknown
0xAA Motorola ADP (40 bit RC4)
0xAB Motorola CFX-256
0xAC Motorola GOST 28147-89 (RFC 5830)
0xAD Motorola Assigned - Unknown
0xAD Motorola Assigned - LOCALIZED
0xAE Motorola Assigned - Unknown
0xAF Motorola AES+
0xB0 Motorola DVP
0xD0 Motorola LOCAL_BR

 

[ki4hyf]

Anyone ever see a P25P2 DES transmission? it would be nice to nail down the algid for that. I have never seen DVI or GSM on the air.

Taken from a P25 P2 system. KID changed to protect the innocent (me). This was captured by FME. I don't think I have any DSD+ logs of DES56-OFB.
ALG_ID: 0x81(DES-OFB) KEY_ID: 0xABCD MI: FC6ABA83D0CD586F MPTT

 

[slavrad]

I would love to look at some captures. ADP is odd these days, why would they use it? (other than economics of avoiding the expense of getting licenses for the better stuff, plus hardware support).

 

[natedawg1604]

I would love to look at some captures. ADP is odd these days, why would they use it? (other than economics of avoiding the expense of getting licenses for the better stuff, plus hardware support).

A LOT of agencies, especially on statewide or large regional systems, historically ordered (and sometimes still order) radios with only ADP, because it costs more per radio for AES. At least with Moto & Harris, ADP comes "free" out of the box. The question is probably asked along the lines of "do we REALLY need AES, at the cost of $xyz more per radio?" Oftentimes the answer is no.

Furthermore, if you're an agency that currently uses ADP (or no ENC) and you share dispatch channels with several nearby agencies, in order to switch to AES, EVERYONE using that channel may have to fork out $$ to upgrade features/flashcodes in their radios, even though the radios "already work just fine".

In general, I suspect AES is more commonly used in big metro areas, especially where the jurisdiction owns/controls their own radio system and has more $$ to spend.

 

[boatbod]

Furthermore, if you're an agency that currently uses ADP (or no ENC) and you share dispatch channels with several nearby agencies, in order to switch to AES, EVERYONE using that channel may have to fork out $$ to upgrade features/flashcodes in their radios, even though the radios "already work just fine".

That right there is the reason why none of the medical channels are encrypted in Maryland. The cost of paying for an encryption license for every ambulance and portable radio in the State that handles EMS in any way would be crazy