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A finite state machine contains a finite number of states and produces outputs on state transitions after receiving inputs. Finite state machines are widely used to model systems in diverse areas, including sequential circuits, certain types of programs, and, more recently, communication protocols. The denial of service (DoS) attacks are the hackneyed and evil cyberattacks in the IP which can be easily...
Research, Development and Evaluation Commission once hold an Internet election of “Top Ten Complaints”, the result showed that the overabundance of phone and Internet fraud was included. This result represents that the phone and Internet fraud trouble people a lot. Thus, this paper will first discuss the analysis of the crime mode of phone and Internet fraud and the collect the security threats of...
Through deeply analysis of INVITE flooding attack of SIP based VoIP system, a novel VoIP flooding detection scheme called CDVFD (Call Duration based VoIP Flooding Detection) is presented. The CDVFD method makes use of SIP signaling bidirectional interaction, and it can make fast detection using Chi-square value, and can distinguish from normal high VoIP traffic. Experimental results show the effectiveness...
Voice-over-IP (VoIP)-based services are becoming a popular alternative to traditional public switched telephony. The increasing number of users make VoIP also an interesting target for attackers. VoIP phishing and identity theft are gaining relevance. The lack of options for the reliable authentication between communication partners and the possibilities for anonymisation in IP-based telephony will...
In this study, we discussed with the protocol of SIP of VoIP. At first, using NS2 simulation software to analysis, then we researched those entities. Because of the impact of VoIP Quality of Service (QoS) as a major factor is the rate of packet loss. And of the human beings, the discontinuous voice caused by a small amount of packet loss can be tolerated. By using actual VoIP equipment, we observing...
This study is focus on SIP of VoIP, and simulated and analysed by NS2. In addition, because of the security issues are the main factor to affect its popularization, and the DDOS attack has become one of the more serious issues in VoIP network security domain. Therefore this research carries on the simulation analysis to various types attack by NS2, and further discusses under the DDoS attack between...
The SIP-based VoIP system is build on the IP network, so it is affected by the IP network security problem. SIP-based VoIP system has many security problems because of the security mechanism of VoIP system and other external factors. These effects relate to the following three aspects: confidentiality, integrity and availability. This paper analyzed the mechanism of VoIP system and the components...
Voice over Internet Protocol (VoIP) is the newest and the fastest growing technology which consists of routing voice conversations over IP-based network. The flexibility of the VoIP system and the convergence of voice and data networks brings with it additional security requirements, VoIP availability is the most important one. Denial-of-service (DoS) attacks are the main concerns with regard to causing...
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