The Study of Coupling ECDH with Dynamic Key Change Scheme for VoIP Security Protection

• Main Authors: Yu-Shuen Liu, 劉宇舜
• Other Authors: Chia-Hui Wang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/uwqwqk

碩士 === 銘傳大學 === 資訊工程學系碩士班 === 95 === VoIP(Voice over IP) technology makes use of voice encoding or compression techniques and packetize for transmitting on the internet. However, the voice packets are easy to eavesdrop from hackers on public network. In this research, we will propose a secure VoIP scheme to protect voice communication from eavesdropping. This secure VoIP scheme will be furnished by SIP(Session Initiation Protocol) and SDP(Session Description Protocol). We also take the advantage of ECDH (Elliptic Curve Diffie-Hellman) key agreement protocol to negotiate the secret key and use this secret key to encrypt/decrypt the voice packet by the well-known AES (Advanced Encryption Standard) encryption. Furthermore, we propose the Elliptic Curve-Dynamic Key Change Scheme to boost the security strength for VoIP by dynamically changing encryption keys. To sum up, the proposed secure scheme will protect the confidentiality of voice communications without affecting the quality of VoIP.