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Voice/Control Channel Decoding Software - For discussion of software applications which decode digital voice formats and trunking control channels. Please use the HF Digital Signals forum for anything below 30MHz.

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Old 08-12-2018, 3:14 PM
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Question DSD+ Event Log abbreviations

Hi,

When the event log screen shows "Enc Group call" and ends with "Alg=GP", does the "GP" indicate the system is using the General Privacy feature?

What are the other abbreviations that might be seen after "Alg=" ?
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Old 08-12-2018, 10:26 PM
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Don't think there is a GP algorithm. Double check your logs.

For DMR, there is BP (Basic Privacy) and EP (Enhanced Privacy)
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Old 08-13-2018, 12:32 AM
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DSD+ occasionally had decode errors that are reflected in the event logs. This includes seeing things that don't make sense such as "Alg=GP" and incorrectly detecting "Enc Group call" on voice streams that are not encrypted. It also generates other odd quirks like incorrect talkgroup and radio IDs.
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Old 08-13-2018, 11:31 AM
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Quote:
Originally Posted by slicerwizard View Post
Don't think there is a GP algorithm. Double check your logs.

For DMR, there is BP (Basic Privacy) and EP (Enhanced Privacy)
Right you are Slicer. Unfortunately I typed GP from memory when I was thinking BP.

Does it indicate AES if they use it?
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Old 08-13-2018, 1:32 PM
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Quote:
Originally Posted by Spitfire8520 View Post
DSD+ occasionally had decode errors that are reflected in the event logs. This includes seeing things that don't make sense such as "Alg=GP"
A bad decode isn't going to make up a nonexistent encryption algorithm.


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Originally Posted by ColoradoRedlands View Post
Right you are Slicer. Unfortunately I typed GP from memory when I was thinking BP.

Does it indicate AES if they use it?
Not for DMR. This system uses AES exclusively, but DSD+ always reports "EP".

https://www.radioreference.com/apps/db/?sid=9481
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