INDEXHABOUTHcopyright © samir amberkar

1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
1.13
1.14
1.15
1.16
1.17
1.18
1.19
1.20

2.1

3.1
3.2
3.3
3.4
3.5




another knowledge site

3GPP Modem
Simulator

Test Your
Knowledge

another knowledge site
1.1

LTE NAS Security
Receiver estimates overflow counter and with sequence number constructs NAS count. Below diagram illustrate working of NAS Count.
  UE MME

eKSI
UL count=u
DL count=d
Capability
KASME
KNASenc/Enc algo id
KNASint/Int algo id

current

   click for better view

Security protected UL NAS message
(MAC, SQNu)


eKSI
UL count=u + 1
DL count=d
Capability
KASME
KNASenc/Enc algo id
KNASint/Int algo id

current

Security protected DL NAS message
(MAC, SQNd)


eKSI
UL count=u + 1
DL count=d + 1
Capability
KASME
KNASenc/Enc algo id
KNASint/Int algo id

current


This concludes the brief discussion on NAS security; for more details, please refer the references listed on next page.


Copyright © Samir Amberkar Page 5 of 6


I II III IV V VI