Introduction Most modern attacks/intrusions are very intelligent leaving no trace of the appearance in the network making detection very difficult. DDoS attack is classified as resource depletion attacks and bandwidth depletion attacks [1]. Protocol exploit attacks and malformed packet attack tie up the critical resources of the victim system. Many of these attacks also use spoofed source IP addresses, thereby eluding source identification. The two most basic types of DDoS attacks are 1) Bandwidth attacks and 2) Application attacks. Bandwidth attacks consume resources such as network bandwidth or equipment by overwhelming with a high volume of packets [2]. Due to overload of packets targeted routers, servers, and firewalls can be rendered unavailable to process valid transactions. Packet-flooding is a form of bandwidth attack in which a large number of seemingly legitimate TCP, User Datagram Protocol (UDP), or Internet Control Message Protocol (ICMP) packets are directed to a specific destination [2]. To make detection difficult these kinds of attacks spoof their source address to prevent identification. Application attacks use the expected behavior of protocols such as TCP and HTTP to the attacker’s advantage by tying up computational resources and preventing them from processing transactions or requests. Any computer in the network can be easily compromised by DDoS attacks without the knowledge of being attacked. Sophisticated and automated DDoS attack tools like Trinoo, TFN, TFN2K, mstream, Stacheldraht, Shaft, Trinity, Knight etc., available in the Internet do not require technical knowledge to launch a high rate flooding attack. The victims are surprisingly government agencies, financial corporations, defense agencies and m... ... middle of paper ... ...al animals,” International Society for Behavioral Ecology, vol. 14, pp. 719-723, 2003. [31] Zhongwen Li and Yang Xiang, “Mathematical Analysis of Active DDoS Defense Systems,” International Conference on Computational Intelligence and Security, Guangzhou, pp. 1563-1566, 2006. [32] G. Preetha, B.S. Kiruthika Devi, S. Mercy Shalinie, “Combat Model based DDoS Detection and Defense using Experimental Testbed: A Quanitative Approach,” International Journal of Intelligent Engineering and Informatics (IJIEI), vol. 1, no. ¾, pp. 261-279, 2011. [33] The Swiss Education and Research Network - Default TTL values in TCP/IP (2002) [Online]. Available: http://secfr.nerim.net/docs/fingerprint/en/ttl default.html. [34] Jaehak Yu, Hansung Lee, Myung-Sup Kim, Daihee Park, “Traffic flooding attack detection with SNMP MIB using SVM,” Comput. Com, vol. 31, no. 17, pp. 4212-4219, 2008.
IDS is a device or software application that monitors a network for an unauthorised attack.
At this juncture, it may be somewhat difficult to accept the proposition that a threat to the telecommunications grid, both wired and wireless, in the United States could potentially be subject to a catastrophic cyber attack. After careful research on the subject, it appears the potentiality of an event of such magnitude, which either disrupts one or the other grids for a long period or destroys either, is both theoretically and realistically impossible. It may be that proponents—those who advance such theories—equate such “doomsday” scenarios as if a cyber attack would or could be of the same magnitude as a conventional or nuclear military strike. Terms such as “cyber Pearl Harbor,” “cyber 9/11” and “cyber Vietnam” have been used to describes potential catastrophic cyber attacks and yet, “Though many have posited notions on what a ‘real’ cyber war would be like, we lack the understanding of how such conflicts will be conducted and evolve.” (Rattray & Healey, 2010, p. 77). Yet, the U.S. government continues to focus on such events, as if the plausibility of small-scale cyber attacks were not as pressing.
These warnings can help users alter their installation’s defensive posture to increase resistance to future attacks. An intrusion detection system is comparable to a burglar alarm system. The car locks to protect the vehicle from theft. In the event someone compromises the lock, the burglar alarm detects this compromise and alarms the owner.
The Aim Higher College’s system administrators and network engineers have described seeing some strange behaviors such as high levels of traffic from many hosts that are causing system outages. The web servers of the college have been shutting down frequently by this traffic, it must be from a hacker group trying to attack the school with malicious software. I will review the network traffic from the college’s intrusion detection system and use an intrusion prevention system to block off these threats from the hackers.
...at proposed a new Worm Interaction Model which is based upon and extending beyond the epidemic model focusing on random-scan worm interactions. It proposes a new set of metrics to quantify effectiveness of one worm terminating other worm and validate worm interaction model using simulations. This paper also provides the first work to characterize and investigate worm interactions of random-scan worms in multi-hop networks (Tanachaiwiwa and Helmy, 2007). For the best possible solution against cyber attack, researchers use Mathematical modeling as a tool to understand and identify the problems of cyber war (Chilachava and Kereselidze, 2009). Such kind of modeling is supposed to help in better understanding of the problem, but to allow such models to be practically workable, it is extremely important to provide a quantitative interface to the problem through the model.
For centuries, the value of horses was known to farming and working communities, but it was not until very recently in history that people began to see the value of a horse for the disabled and mentally handicapped. Hippotherapy, as defined by Barbara Smith, is “the use of the horse as a medical treatment strategy and not as a method to teach riding.” Dozens of studies show the effectiveness or non-effectiveness of this specialized therapy for certain disorders. The horse provides a stepping stone to well-being for people with debilitating illnesses that otherwise could not achieve optimal wellness through conventional therapies.
There are many types of intrusion detection systems, network intrusion detection, host based, protocol based, application protocol bas...
...xamples taking under consideration like modeling and countermeasures based on internet threat monitors. But still in future there may be new traffic implementation by the attackers for which we need to change the methods and updates for users and their software.
Penetration testing has been well popularized by the media. Many companies are now offering penetration services to identify vulnerabilities in systems and the surrounding processes. This report will Discuss “Penetration Testing” as a means of strengthening a corporate network’s security. This report is divided into three parts. Introduction will give you a brief and basic overview of Penetration Testing and why we need Penetration Testing, The second part is the technical breakdown explains The strategy, model and type of Penetration Testing. In the conclusion, we will discuss both the value and limitation of Penetration Testing.
Within the last decade, the internet has proven to be the most efficient way to complete tasks in today’s society. Every major business in today’s society relies on the internet to conduct business. Though the internet is a useful tool, our reliability on it opens up the door for cyber-attacks that can be detrimental to business as a whole. One example of a cyber-attacks that have recently started becoming more prevalent are DDoS attacks. Recently, DDoS attacks have been a rising issue for businesses owners who run their own servers, such as video game companies and other high profile web servers, including banks and other credit card payment gateways.
Although Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) have been grouped together here (IDPS), there are distinctions between them. On the most basic level, both will monitor the network...
Without proper protection, any part of any network can be susceptible to attacks or unauthorized activity. Routers, switches, and hosts can all be violated by professional hackers, company competitors. In fact, according to several studies, more than half of all network attacks are waged internally. To determine the best ways to protect against attacks, we should understand the many types of attacks that can be instigated and the damage that these attacks can cause to data. The most common types of attacks include Denial of Service (DoS), password, an...
A cyber crime called 'Bot Networks', wherein spamsters and other perpetrators of cyber crimes remotely take control of computers without the users realizing it, is increasing at an alarming rate. Computers get linked to Bot Networks when users unknowingly download malicious codes such as Trojan horse sent as e-mail attachments. Such affected computers, known as zombies, can work together whenever the malicious code within them get activated, and those who are behind the Bot Networks attacks get the computing powers of thousands of systems at their disposal.
TCP/IP is a network model which enables the communication across the Internet. The most fundamental protocol on which the Internet is built. This is made up of the 2 common networking protocols, TCP, for Transmission Control Protocol, and IP, for Internet Protocol. TCP maintains and handles packet flow linking the systems and IP protocol has the ability to handle the routing of packets. However The TCP/IP stack consists of 5 layers first being application layer, the transport layer, then the network layer, the link layer and finally the physical layer. The assignment focuses on the three middle layers and is divided into five parts. Firstly explaining how the TCP and UDP the most vital protocols needed to deliver and communicate.
... middle of paper ... ... TCP/IP operates at levels 3 and 4 of the OSI model.