NAS-PDU confusion
Hi, I am analyzing a pcap file on 5g packets. Under the NAS-PDU (IN the initial registration request message), it shows both Security Protected NAS 5Gs Message Plain NAS 5Gs Message
I am a little confused.. Is the message encrypted or integrity protected? Or is it not?
Non-Access-Stratum 5GS (NAS)PDU
Security protected NAS 5GS message
Extended protocol discriminator: 5G mobility management messages (126)
0000 .... = Spare Half Octet: 0
.... 0001 = Security header type: Integrity protected (1)
Message authentication code: 0xd0b61b32
Sequence number: 111
Plain NAS 5GS Message
Extended protocol discriminator: 5G mobility management messages (126)
0000 .... = Spare Half Octet: 0
.... 0000 = Security header type: Plain NAS message, not security protected (0)
Message type: Registration request (0x41)
5GS registration type
NAS key set identifier
0... .... = Type of security context flag (TSC): Native security context (for KSIAMF)
.001 .... = NAS key set identifier: 1
5GS mobile identity
Length: 11
1... .... = Spare: 1
.1.. .... = Spare: 1
..1. .... = Spare: 1
...1 .... = Spare: 1
.... 0... = Spare: 0
.... .010 = Type of identity: 5G-GUTI (2)
Mobile Country Code (MCC): United States (310)
Mobile Network Code (MNC): Unknown (999)
AMF Region ID: 1
0000 0000 10.. .... = AMF Set ID: 2
..00 0011 = AMF Pointer: 3
5G-TMSI: 16777303 (0x01000057)
UE security capability
Element ID: 0x2e
Length: 2
1... .... = 5G-EA0: Supported
.1.. .... = 128-5G-EA1: Supported
..1. .... = 128-5G-EA2: Supported
...1 .... = 128-5G-EA3: Supported
.... 0... = 5G-EA4: Not supported
.... .0.. = 5G-EA5: Not supported
.... ..0. = 5G-EA6: Not supported
.... ...0 = 5G-EA7: Not supported
0... .... = 5G-IA0: Not supported
.1.. .... = 128-5G-IA1: Supported
..1. .... = 128-5G-IA2: Supported
...1 .... = 128-5G-IA3: Supported
.... 0... = 5G-IA4: Not supported
.... .0.. = 5G-IA5: Not supported
.... ..0. = 5G-IA6: Not supported
.... ...0 = 5G-IA7: Not supported
NAS message container
Element ID: 0x71
Length: 48
Non-Access-Stratum 5GS (NAS)PDU
**
Plain NAS 5GS Message
Thank you