UMTS . . 23.6 . 3G , (.. ). - ( ) , USIM . 128 .
. 23.6.
. ( ) .
AKA (Authentication and Key Agreement). , . , VLR SGSN , TMSI P-TMSI ( IMSI).
1 VLR SGSN AUC . IMSI. AUC HLR IMSI.
:
RAND ();
, XRES;
, (Cipher Key);
, IK (Integrity Key);
() AUTN (An Authentication Token).
, . 2 ( ) HLR VLR SGSN .
1 2 ѹ7 MAP. 3 ( ) - RAND AUTN. 3 USIM, (.. - UMTS - UICC, UMTS Integrate Circuit Card). USIM AUTN , . USIM RAND , () RES .
4 ( ) RES. UE VLR/SGSN, RES XRES. RES XRES .
|
|
, UMTS , GSM, - ( , ).
, UE/USIM HLR/AUC .
. 23.7 HLR/AUC. - () IMSI . , GSM - . .
. 23.7.
f1, f2, f3, f4, f5. f1 f5 , f2 .
. 23.7 :
SQN (Sequence Number) - ;
AK (Anonymity Key) -, SQN;
AMF (Authentication Management Field) - . AMF ;
MAC (Message Authentication Code) - () (. , .2). MAC = f(K, AMF, SQN, RAND).
AV AUTN, XRES ( f2) CK ( f3) IK ( f4). AUTN =SQN XOR AK || AMF|| MAC.
. 23.8. UE/USIM
. 23.8 UE/USIM. ( ) UMTS , . f5 f1, f5 SQN. f1, (), . MAC, AUTN. ( ) , , RAND AUTN , (.. AUC ). , .
. 23.8 RES , CK IK.