increasing the popularity of sip based services (voip, iptv, ims infrastructure) lead to concerns about its ‎security. the main signaling protocol of next generation networks and voip systems is session initiation protocol ‎‎(sip). inherent vulnerabilities of sip, misconfiguration of its related components and also its implementation ‎deficiencies cause some security concerns in sip based infra...

Denial-of-Service and Distributed Denial-of-Service is costing the economy world-wide billions of dollars. The economy is the cornerstone of our society and its collapse will certainly change the way in which humanity exists today. The three main goals of computer security are availability, confidentiality and integrity. The focus of this paper is on attacks that compromise the availability of ...

DISCLAIMER: To the extent permitted by law, this document is provided without any liability or warranty. Accordingly it is to be used only for the purposes specified and the reliability of any assessment or evaluation arising from it are matters for the independent judgment of users. This document is intended as a general guide only and users should seek professional advice as to their specific...

Denial of service attacks are not new. However, the recent increase of their power and their use by organized criminal organizations make necessary to consider them as one of the major issues IT infrastructures will have to face in the next few years. Trying to defeat those attacks without understanding their technical aspects is illusory. As such, this document intends to provide as much detai...

Although denial of service attack has been becoming a fast-growing concern in security research, previous work focused on a type of classical denial of service caused by resource exhaustion. In this paper, a different type of network denial of service attack is discussed. Since traditional models and countermeasures are not applicable, we discuss solutions that can defend this non-classical ser...

What is network denial of service (DoS), and why is it such a problem? This research project has sought to investigate these questions and look at the deeper questions such as can denial of service be removed, can it be detected and can network systems adequately respond to denial of service incidents should they become subjected to them? This paper describes some issues that make network denia...

Resistance of denial of service attacks is a key security requirement in voting protocols. Acquisti protocol plays an important role in development of internet voting protocols and claims its security without strong physical assumptions. In this study firstly Acquisti protocol is modeled in extended applied pi calculus, and then resistance of denial of service attacks is proved with ProVerif. T...

Owning to the huge damage and difficulty of prevention of denial of service attacks in security protocols, people pay serious attentions on analysis, verification and prevention of denial of service attacks. Formal method in computational model is a powerful tool used to analyze and prove securities in security protocols, network and distributed system. But until now in computational model ther...

Distributed Denial of Service (DDoS) attacks have become a large problem for users of computer systems connected to the Internet. DDoS attackers hijack secondary victim systems using them to wage a coordinated large-scale attack against primary victim systems. As new countermeasures are developed to prevent or mitigate DDoS attacks, attackers are constantly developing new methods to circumvent ...