Kenwood ADP/ARC4 Encryption

[firemedic834]

I'm looking for help and guidance on the following trouble with a P25 conventional frequency with ARC4 encryption not transmitting or receiving between Kenwood and Motorola radios.

1. P25 Conventional Frequency
2. ARC4 Encryption
3. Motorola APX8000, Kenwood NX5200, and Kenwood NX5700 with the proper encryption modules installed.
4. Frequencies match in the Motorola and Kenwood programming software.
5. Key ID, key name, and key data all match.
6. The frequency will encrypt between two Kenwood radios, however; not a Kenwood and Motorola.

Any suggestions or ideas?

Thank you.

 

[tweiss3]

Just to confirm, radio ID's are different, correct?
Is encryption strapped for the channel? What about talkgroup strapped?
What is the P25 modulation, LSM or C4FM?

 

[kd4efm]

Typically the encryption KEY ID is in hex with Motorola, decimal with kenwood.
So, with the Kenwood you will need to match the decimal number to the M hex key ID. I posted this a few years ago in this forum.

 

[kd4efm]

Here is an example, decimal (hex)

P25 CKRID 1 DES Alpha KEY 13(000D) 0110203140516170
P25 CKRID 2 DES BRAVO KEY 15(000F) 01020407080B0D0E
P25 CKRID 3 AES ALPHA KEY 49(0031) 66546A576E5A7234753778214125442A 472D4B6150645367566B587032733576
P25 CKRID 4 AES BRAVO KEY 50(0032) 5970337336763979244226452948404D6351665468576D5A7134743777217A25
P25 CKRID 13 AES CHARLIE KEY 60(003C) 7C69C8D0EC9F5620803819DB5427155668A591B12ECD95522B03AECE5EED621C

 

[firemedic834]

Just to confirm, radio ID's are different, correct?
Is encryption strapped for the channel? What about talkgroup strapped?
What is the P25 modulation, LSM or C4FM?

Yes, the radio IDs are different.
Yes, the encryption is strapped for the channel and talk group.
P25 modulation is C4FM.

 

[firemedic834]

Typically the encryption KEY ID is in hex with Motorola, decimal with kenwood.
So, with the Kenwood you will need to match the decimal number to the M hex key ID. I posted this a few years ago in this forum.

The Motorola HEX was converted to decimal. The conversion produces a twelve (12) character decimal, however; the key data field in the KPG-D1N has a ten (10) character limit.

The key data field I'm referencing is Encryption > Multi-Key List - Key Data (Fifth column in the table). Is there a solution to that?

 

[firemedic834]

Problem resolved. I misunderstood a little bit of the above. Converted the Motorola Key ID HEX to decimal. Inserted the decimal conversion in the KEY ID in the KPG-D1N and it restored the ADP/ARC4 communication between Motorola and Kenwood.

 

[AM909]

... Motorola APX8000, Kenwood NX5200, and Kenwood NX5700 with the proper encryption modules installed. ...

Just to pick a nit, on the NX-5xxx, P25 ARC4 is a free option and DMR ARC4 is a (cheap) license key. The hardware module (KWD-AE30K or KWD-AE31K) is only needed for AES/DES.

 

[otobmark]

Just to pick a nit, on the NX-5xxx, P25 ARC4 is a free option and DMR ARC4 is a (cheap) license key. The hardware module (KWD-AE30K or KWD-AE31K) is only needed for AES/DES.

Also, the fact that you CANNOT use a keyloader to enter ARC4 keys even with the hardware module is why NX5xxx were decertified for use on our statewide trunk system. We require keyloading via KVL for ADP and AES256 for comsec which NX5xxx doesn't do.