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In LTE, why the integrity and encryption protection order is different in NAS and AS layer?

+1 vote
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In LTE, if a NAS packet is going to be sent, the encryption is followed by integrity protection in NAS layer, but in RRC/PDCP layer, When RRC messages are being sent, they are integrity protected first and then encrypted before being sent, unlike NAS messages were. Why the integrity and encryption protection order is different in NAS and AS layer?

posted Oct 12 by anonymous
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Similar Questions
+1 vote

Is it necessary to implement both integrity and ciphering together for a message ? or for certain cases only integrity or only ciphering required ?

+1 vote

I am bit confused why the different order are used for integrity and ciphering of RRC and NAS message ?
What if the same order (ciphering and then integrity) is used for RRC message ?

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