Search for: [Description = "Voice over Internet Protocol \(VoIP\) has been recently one of the more popular applications in Internet technology. It benefits lower cost of equipment, operation, and better integration with data applications than voice communications over telephone networks. However, the voice packets delivered over the Internet are not protected. The session initiation protocol \(SIP\) is widely used signaling protocol that controls communications on the Internet, typically using hypertext transport protocol \(HTTP\) digest authentication, which is vulnerable to many forms of attacks. This paper proposes a new secure authentication and key agreement scheme based on Digital Signature Algorithm \(DSA\) and Elliptic Curve Cryptography \(ECC\) named \(ECDSA\). Security analysis demonstrates that the proposed scheme can resist various attacks and it can be applied to authenticate the users with different SIP domains."]

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