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In general when an integrity protection is becomes mandatory and when encryption becomes mandatory ?

+1 vote
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Is it necessary to implement both integrity and ciphering together for a message ? or for certain cases only integrity or only ciphering required ?

posted Oct 12, 2017 by anonymous

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+2 votes

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?

+1 vote

I was going through the security specification of 5G network and stopped at a point where it was mentioned that UE shall support integrity protection of user data along with the integrity protection of RRC and NAS-Signalling. Section 5.1.3.1 also mentions that integrity protection of the user data between UE and gNB is optional to use.
I want to know that for which cases/scenarios, it would be needed to enable integrity protection for user data between UE and gNB ?
Enabling both integrity and ciphering for the user data would be an overhead, therefore I started thinking about scenarios/cases.

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