Message Integrity Code (MIC) doubt

[USCOLPWAN2019]

Hi to everyone have a great day!
can you help me to solve a doubt with this two images, please?:


¿The Message Integrity Code (MIC) its the encryptation of AppKey and is send with the message that contains the DevEUI, AppEUI (and DevNonce) like in the first picture or the Message Integrity Code (MIC) its the encryptation of AppKey, DevEUI, AppEUI and DevNonce like i understand in the second image (I do not know what is MHDR) ?
Thanks for your attention!

[cslorabox]

It would probably be worthwhile to spend some time reading the LoRaWAN specification.

That said, you don’t need to dig into the details of this unless you are writing or debugging the actual code that implements LoRaWAN on the node end (or in a non-TTN context, the server end)

[BoRRoZ]

see

Message Integrity Code (MIC)

Hi! i have a few question about the OTAA activation: I kwon that the join request is a package or message that contains AppEUI, DevEUI and DevNonce, ¿at this point this join request are encrypted by a hash function or something similar? The MIC would be the result of pass the join request and the AppKey by a hash function (AES 128) ? how the end nodes get the AppKey? and how the Aplicattion server get it? how many bits have the AppEUI, DevEUI, DevNonce and AppKey? Thanks and Sorry for my engl…