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LTE : I came to know that integrity and ciphering order for RRC and NAS level are reverse to each other ?

+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 ?

posted Feb 21, 2016 by Harshita

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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

What is the main reason for introducing ciphering/integrity at NAS level (when the same is present at RRC level as in UMTS)?

+4 votes

For NAS security mode command ,input giving to CMAC (integrity check) function at both UE and MME side are same but still im getting intgrity check failed ,for exp:
1) KEY = \xef\x6b\xee\xda\x7f\x66\xc5\x67\x34\xa6\x1b\xcf\x1e\x8f\x12\x87.
2) COUNT = 0.
3) BEARER ID =0.
5) mesage = \x07\x5d\x22\x00\x02\xe0\xe0.
6)sequence no. = 0x00.
please can you explain me with this example ,what will be the final message(message forming) M.