Confidentiality of VOIP data using efficient ECDH key exchanging mechanism
T. Subashri, Kalluri Krishna Reddy, V. Vaidehi · 2010
Abstract—The most demanding low cost technology is voice over internet protocol (VoIP). However, VoIP packets are easy to eavesdrop by hackers on public and private cryptosystems. Because symmetric key cryptosystems such as Advanced Encryption Standard (AES) uses weak keys for VoIP packet encryption. So in this work, an approach for strengthening AES algorithm is developed. Instead of using AES key directly from its own key expansion algorithm and Diffie Hellman (DH) based key for AES algorithm, the hashed Elliptic Curve Diffie Hellman (ECDH) based AES key is used to enhance confidentiality of VoIP data. Hashed ECDH based AES key provides high computational complexity to break the key compared to AES self generated key and DH based AES key. So, this approach makes it hard for the hacker to estimate encryption key values.