A new Authentication and Key Agreement protocol for SIP in IMS
Saliha Mallem, Zemmache Amina, Chafia Yahiaoui · 2015
IP Multimedia Subsystem (IMS) is widely considered as the main solution for Next Generation Network (NGN). Its signaling plan is based on S IP protocol. However, this protocol is exposed to various security threats. The third Generation Partnership Project (3GPP) proposed an Authentication and Key Agreement protocol called IMS-AKA to address SIP vulnerabilities in IMS network. Although IMS-AKA provides attractive features, several weaknesses were identified both on security (disclosure of identities) and performances (complexity) aspects. In this paper, we propose an improved protocol, called IMS-AKA+ that addresses effectively the obscuring users' identities by using a key-less cryptography. Furthermore, the protocol preserves performances by reducing the computational cost and the storage space due to the use of Elliptic Curve Cryptography (ECC).