Question about nRF5340 Audio DK link-key

[HaiwenChen]

I want to decrypt some packets caught in LE Audio(Using the sample:nRF5340 Audio application), but need the link-key.

According to this case, I add these to prj.conf to get the link-key.

CONFIG_BT_LOG_SNIFFER_INFO=y
CONFIG_BT_DEBUG_LOG=y

Get the link-key:

I use the link-key for decryption but failed, and I notice the answer of this case change the link-key.

The link-key in log need to transform?How to transform it?

Please help! Thanks!

[dejans]

Hi,

Your links to the relevant tickets lead to the same one. Did you maybe want to link to 2 different tickets?

The link-key in log need to transform?How to transform it?

Can you rephrase this? What kind of transformation do you refer to?

Best regards,
Dejan

[HaiwenChen]

Hi dejans,

Sorry, English is not my native language, so my expression may not be clear enough.

Yes, the two links lead to the same one.

The answer in the link shows different link-key between log and Ellisys panel, why the link-keys are different?

I want to know:

Can the link-key printed in log be directly used for decryption?

If no, how to transform the link-key that can be used for decryption.

Thank you for your patience!

[dejans]

Hi,

Which device is your console log taken from? 

Have you entered the key you obtained from the console log to the Ellisys panel?

Best regards,
Dejan

[HaiwenChen]

I use two nRF 5340 Audio DKs to run nRF5340 application.

Yes, I entered it.

[dejans]

Hi,

Could you please provide more information what you do after you got SC LTK from the terminal?

Do you look at the key on only one device or on both devices?

Best regards,
Dejan