Qiong Pu, Jian Wang and Shuhua Wu Secure SIP authentication scheme supporting lawful interception Security and Communication Networks 6
We show that the SIP authentication scheme of Arshad et al. is still vulnerable to offline dictionary attacks and propose a new authentication and key agreement scheme for SIP with provable security. Moreover, we also provide an extended scheme capable of protecting media stream's privacy even against SIP servers while supporting lawful interception.
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