R30 NXDN encryption decode

[KevinC]

Anyone have any experience on how long it takes the R30 to decode an encrypted signal? Tenth of a second? One second?

And no lectures about encryption please.

 

[chill1971]

I have never noticed a delay. It passed unencrypted signals, and switches between encrypted and unencrypted seamlessly.

 

[KevinC]

I have never noticed a delay. It passed unencrypted signals, and switches between encrypted and unencrypted seamlessly.

Perfect. Thank you.

 

[Reconrider]

I've only had 1 time where it wouldn't decode, and that was because the signal wasn't that great.
Other than that, almost instant decode with nxdn encryption

 

[UAT_978]

Anyone have any experience on how long it takes the R30 to decode an encrypted signal? Tenth of a second? One second?

And no lectures about encryption please.

If you are scanning a TRS, you will have to put the channel in as clear and then again with the encryption key. If you have more than one key, the channel is duplicated for each key. I have not noticed any appreciable delay in doing this and it happily will skip over the channels if they are assigned the wrong key or if encrypted with out the key.

In other words, if the channel is mixed, it will not automatically select the encryption if the channel is set to clear, conversely it seems to remain muted if a clear transmission occurs when you have the channel set to enc with a key.

 

[KevinC]

If you are scanning a TRS, you will have to put the channel in as clear and then again with the encryption key. If you have more than one key, the channel is duplicated for each key. I have not noticed any appreciable delay in doing this and it happily will skip over the channels if they are assigned the wrong key or if encrypted with out the key.

In other words, if the channel is mixed, it will not automatically select the encryption if the channel is set to clear, conversely it seems to remain muted if a clear transmission occurs when you have the channel set to enc with a key.

Hmm…mine isn’t skipping over transmissions with the wrong key. It just plays the undecrypted audio.

 

[UAT_978]

I just went and looked at my file and while I have both NXDN and DMR set up this way, It was DMR I had to put in each channel as Clear or ENC. I cannot remember at NXDN now. Ill have to fire it up and see when I get home.

 

[KevinC]

Thinking about it more. How could it skip over a wrong key transmission? It doesn’t have a key ID, so unless the key variable is sent OTA it wouldn’t know if it’s the correct key or not. Or am I missing something?

 

[UAT_978]

I assumed it didnt produce decoded audio so it went along to the next channel.

 

[KevinC]

I understand how this encryption works now. It’s a preset key, so 1-32,767 are the key ID’s. So yes, it should skip an incorrect key….I think.

 

[racingfan360]

It will decode an encrypted NXDN signal with the right key set almost instantly, very little difference if any when compared side by side with a Nexedge transceiver.

With no key set, an R30 will lock onto an encrypted channel but it mutes the audio output. With the wrong key set, an R30 will unmute and output garbled audio. It doesn't have any KeyID capability, and it ignores those bits of the transmission, so if two different keys are used on the same channel, it will come through clear on one (when the right key is used) and the other as garbled (wrong key used).

>so 1-32,767 are the key ID’s.
Not quite right. NXDN has nearly 33k possible keys from 1-32767. Most portables can have 16 possible keys programed at any one time so that's 16 possible KeyIDs (KeyID 0-15).

 

[KevinC]

It will decode an encrypted NXDN signal with the right key set almost instantly, very little difference if any when compared side by side with a Nexedge transceiver.

With no key set, an R30 will lock onto an encrypted channel but it mutes the audio output. With the wrong key set, an R30 will unmute and output garbled audio. It doesn't have any KeyID capability, and it ignores those bits of the transmission, so if two different keys are used on the same channel, it will come through clear on one (when the right key is used) and the other as garbled (wrong key used).

>so 1-32,767 are the key ID’s.
Not quite right. NXDN has nearly 33k possible keys from 1-32767. Most portables can have 16 possible keys programed at any one time so that's 16 possible KeyIDs (KeyID 0-15).

Unfortunately I see you are correct. It will pass garbled audio on an incorrect key. Makes it difficult to scan between different keys.

 

[racingfan360]

The manual says the R30 has a feature called Fast Unmute, which AFAIK claims it will only unmute the audio when the key matches that in use. It's been a while since I tested but my recollection was it did nothing/didn't work as advertised. I reported it to Icom and haven't heard/seen anything from them since.

 

[KevinC]

The manual says the R30 has a feature called Fast Unmute, which AFAIK claims it will only unmute the audio when the key matches that in use. It's been a while since I tested but my recollection was it did nothing/didn't work as advertised. I reported it to Icom and haven't heard/seen anything from them since.

Thanks. Tried it and it works intermittently. Better than nothing though.

When it works I may get a blip and that’s it, other times it just passes the garbled audio but will randomly move on after a few seconds…or not.

 

[UAT_978]

Ill have to check my firmware version, but I remember when I did this like a year ago, it remained muted on both DMR and NXDN with incorrect keys.

 

[racingfan360]

Ill have to check my firmware version, but I remember when I did this like a year ago, it remained muted on both DMR and NXDN with incorrect keys.

Are you confusing DMR with dPMR? An Icom R30 won't do anything with DMR, scrambled or not.

 

[UAT_978]

dur... forget DMR, I dont know why i mentioned that. Time to go take a nap lol.