Table 1 Symbols used in UMTS-AKA-protocol/UMTS-IMS-AKA-protocol.

VLR,HLR

Visitor Location Register, Home Location Register

AuC, SQN

Authentication Centre, Sequence Number

USIM

Universal Subscriber Identity Module

IMSI

International Mobile Subscriber Identity

TMSI

Temporary Mobile Subscriber Identity

AV, AUTN

Authentication Vector, Authentication Token

K

Secret Key which share between USIM and AuC

MAC

Messages Authentication Code

AMF

Authentication Management Field

Rand, RES

Random Number, User Response

XRES

Expected User Response

CK, IK, AK

Cipher Key, Integer Key, Authentication Key

f1 f5

Authentication and Key Generation Function

UE

User Equipment

IMPI, IMPU

IP Multimedia Private Identity , IP Multimedia Public Identity

P-CSCF

Proxy Call Service Control Function

I-CSCF

Intergating Call Service Control Function

S-CSCF

Service Call Service Control Function

P-CSCF

Proxy Call Service Control Function