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Detecting encryption protocol

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PVPD730

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Does anyone know if software exists that can detect what type of encryption is being used on a particular radio system (ADP, AES, DES, etc)? Let me make it clear that I'm NOT trying to crack keys or anything like that...I simply want to know what protocols are being used.
 

gewecke

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Do you want to know next weeks lottery numbers too.........

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PVPD730

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I personally haven't been exposed to encryption enough to know the differences in the sound, but I do have this document that might help you:

http://www.akardam.net/moto/docs/mirrored/encryption.pdf

I know DES-OFB & ADP sound the same (those are the 2 I've heard around Charlotte). I'd be interested in knowing if there's any hints that give away the protocol in use.

Thanks for the link! Yes, encryption all sounds the same (garbled), and it's hard to determine what's exactly being used. What I'm looking for is something maybe similar to pro96com (that one we all know picks up activity on a P25 control channel). For clarification purposes, I'm trying to find software (if it even exists) that can monitor talkgroup activity and see what flavor of ENC is being used.
 

MattSR

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Its easy. Download OP25 from OP25 and run the wireshark plugin. It will tell you the protocol in use.

Heres a screencap of an encryption channel. YOu can see in the middle under Encryption Sync that the Algo is DES-OFB (AlgID 0x81) and the KeyID is 0x1007.

AFP4.png
 

MattSR

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I'd be interested in knowing if there's any hints that give away the protocol in use.

No hints needed - P25 sprays this information over the channel in the clear every 360ms. Encryption Algorithm ID and Key ID is transmitted in the HDU header packet and the ES Sync fields of the LDU2 voice frame.

This information is used so the radio can select the correct encryption key in a multikey environment.
 

PVPD730

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Its easy. Download OP25 from OP25 and run the wireshark plugin. It will tell you the protocol in use.

Heres a screencap of an encryption channel. YOu can see in the middle under Encryption Sync that the Algo is DES-OFB (AlgID 0x81) and the KeyID is 0x1007.

Matt, I made every attempt to follow those instructions you listed, and still no luck. Is that OP25 program even compatible with Windows? I saw something on there about Linux which was all foreign to me. I was looking for something more straightforward that I could simply download, run, and plug the scanner in to snag data. OP25 wants me to do something with a source code, then build out. Seems a bit complicated to setup. At any rate, I truly appreciate you taking the time to respond. Looks like a pretty sweet program :).
 

SCPD

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Seems a bit complicated to setup. At any rate, I truly appreciate you taking the time to respond. Looks like a pretty sweet program :).
OP25 is built on GNU radio. Its a framework, not an application. Most of the examples assume a USRP as the receiver.

DSD might be an option to run out-of-the-box. I don't know if it displays algID and keyID. You would need a radio tapped for discriminator audio.
 

PVPD730

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OP25 is built on GNU radio. Its a framework, not an application. Most of the examples assume a USRP as the receiver.

DSD might be an option to run out-of-the-box. I don't know if it displays algID and keyID. You would need a radio tapped for discriminator audio.

Thanks! I'll look into it further.
 
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