The Design and Implementation of a Fraud Preventing Mechanism for Voice over IP

• Main Authors: Li, Ssu-Hsien, 李思賢
• Other Authors: Chen, Whai-En
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/33638863383084719533

碩士 === 國立宜蘭大學 === 資訊工程研究所碩士班 === 100 === Recently, the Voice over Internet Protocol (VoIP) is getting more and more popular with the increasing Internet. But the network also causes many threats to VoIP. There are Denial of Service (DoS) flooding attacks, SPAM over Internet telephone (SPIT) annoyance advertisement, Eavesdropping and Fraud call. Among these threats, the fraud damages properties of the Service providers and the use VoIP users. To increase the security of VoIP calls, this thesis design a proactive detection and real-time defense mechanism to prevent the VoIP fraud. We analyze the personal habits such as calling behavior and the VoIP message based on the CDR (Call Detail Record) from three real VoIP service platforms. Upon the frauds are detected, the server redirects the call to the IVR (Interactive Voice Response), for further authentication. This thesis utilizes SVM to detect the VoIP frauds, and improves the accuracy and processing time of the SVM.