3.2 SYN Cookie Defense As touched on earlier, there is a DDoS SYN Flood attack, which involves sending a large amount of TCP SYN requests to flood the server, making it unavailable. If the server allocation is for legitimate requests, attackers will not exhaust the server. Intrusion detection regarding SYN requests is a form of defense. There is a common algorithm to use when using intrusion detection. While full time monitoring of traffic, there is no need to start sub-detection in the requests. When the detection test shows normal traffic, the possibility of attack is low because the potential of a false negative is low. On the other hand, when the traffic is abnormal the algorithm should stop and enable the secondary filter, attempting to find most attack action. Figure 6 shows a flowchart of such algorithm. Figure 6 SYN cookie technology uses the idea that while returning the TCP SYN + ACK packet, the TCP server sends a cookie value instead of a specific data area [6]. As a result, the server can check the cookie value when receiving the response. One major problem with how it works currently is that it requires high computational complexity. Few approaches have been used to reduce complexity using temporary storage of SYN packet information, but that results in the need of large data capacity. There is a new algorithm that incorporates a random key to encrypt packets of information, which increase security, speed, and safety. Furthermore, the new program adds optional IP options for validation of a trusted packet. There are many other researchers looking for more methods of SYN defense methods in order to protect TCP protocols. 3.3 Stochastic Fairness Queuing As mentioned earlier, attackers frequently use flood-ba... ... middle of paper ... ....1 (2012): 27-33. Print. [8] Kiruthika, First N.1. "A New Approach To Defend Against Ddos." Computer Science & Telecommunications31.2 (2011): 93-101. Applied Science & Technology Source. Web. 25 Feb. 2014. [9] Lonea, Alina Madalina1, Daniela Elena2, and Huaglory3, Tianfield. "Detecting Ddos Attacks In Cloud Computing Environment." International Journal Of Computers, Communications & Control 8.1 (2013): 70-78. Applied Science & Technology Source. Web. 25 Feb. 2014. [10] Sheth, Chirag, and Rajesh Thakker. "Performance Evaluation and Comparison of Network Firewalls under DDoS Attack." International Journal of Computer Network and Information Security 5.12 (2013): 60-67. Print. [11] -, Yu Ming. "Mitigating Flooding-Based DDoS Attacks by Stochastic Fairness Queueing." INTERNATIONAL JOURNAL ON Advances in Information Sciences and Service Sciences 4.6 (2012): 145-52. Print.
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.
IPSec – Internet Protocol Security (IPsec) - is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session.
The first odd network behavior that was reported by the network engineers and the system administrators was an analysis that showed that a single host on the network is opening hundreds of SSH sessions to every single other host on the Aim Higher College’s network every minute. This attacker or hacker is flooding the network with the SSH sessions to bring the web servers down to get some classified information. The second odd behavior was reported that hundreds of hosts are constantly sending SYN packets only to one of the web servers on the Aim Higher college’s campus. Furthermore, this attacker is trying to flood one of the web servers just by
The Hacker Crackdown: Law and Disorder on the Electronic Frontier by Bruce Sterling is a book that focuses on the events that occurred on and led up to the AT&T long-distance telephone switching system crashing on January 15, 1990. Not only was this event rare and unheard of it took place in a time when few people knew what was exactly going on and how to fix the problem. There were a lot of controversies about the events that led up to this event and the events that followed because not only did it happen on Martin Luther King Day, but few knew what the situation truly entailed. There was fear, skepticism, disbelief and worry surrounding the people that were involved and all of the issues that it incorporated. After these events took place the police began to crackdown on the law enforcement on hackers and other computer based law breakers. The story of the Hacker Crackdown is technological, sub cultural, criminal, and legal. There were many raids that took place and it became a symbolic debate between fighting serious computer crime and protecting the civil liberties of those involved.
In 1980, James Anderson’s paper, Computer Security Threat Monitoring and Surveillance, bore the notion of intrusion detection. Through government funding and serious corporate interest allowed for intrusion detection systems(IDS) to develope into their current state. So what exactly is IDS? An IDS is used to detect malicious network traffic and computer usage through attack signatures. The IDS watches for attacks not only from incoming internet traffic but also for attacks that originate in the system. When a potential attack is detected the IDS logs the information and sends an alert to the console. How the alert is detected and handled at is dependent on the type of IDS in place. Through this paper we will discuss the different types of IDS and how they detect and handle the alerts, the difference between a passive and a reactive system and some general IDS intrusion invasion techniques.
TOR (Roger Dingledine) is a circuit based low-latency anonymous communication service. TOR is now in its second generation and was developed from the Onion routing program. The routing system can run on several operating systems and protect the anonymity of the user. The latest TOR version supports perfect forward secrecy, congestion control, directory servers, integrity checking and configurable exit policies. Tor is essentially a distributed overlay network which works on the application layer of the TCP protocol. It essentially anonymizes all TCP-based applications like web-browsing, SSH, instant messaging. Using TOR can protect against common form of Internet surveillance known as “traffic analysis” (Electronic Frontier Foundation). Knowing the source and destination of your internet traffic allows others to track your behavior and interests. An IP packet has a header and a dat...
Summary Report for: Computer Security. (2010). January 10, 2011, from O*net Online: retreived January/15/2011 http://online.onetcenter.org/link/summary/15-1071.01
Johansson, Jesper M. "Managing the Windows Vista Firewall." TechNet 2008: n. pag. Web. 14 Nov. 2013. http://technet.microsoft.com/en-us/magazine/2008.06.security.aspx
attempt to force a network offline and unavailable to its intended users. This process is typically performed by flooding a network with communication requests until the server cannot respond to the traffic, thus making the server go offline and become available. This process is relatively simple to perform to the average person through online programs. Since it is so easy perform, it has become a rising issue simply because anyone has the ability to hack into various servers. One example in recent news of DDoS attacks comes from Riot Games, developer of the popular online multiplayer video game League of Legends. After a month of inconsistency with their server stability and frequent shut downs, Riot Games reported that within the l...
There are numerous network security devices and tools available to aid in computer network defense, and these tools are often relied upon for protecting against increasingly sophisticated, stealthy, and damaging attacks. When acting alone, the current generation of security devices has an exceedingly difficult time providing an effective defense against such threats, and the situation is particularly grim for targeted or novel attacks.
Waterman, Shaun. "Obama Hits Pause on U.S. Action in Face of Crippling Cyber Strikes from Syria, Iran." Washington Times 28 Aug. 2013. Print. (Source B)
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...
In this era when the Internet provides essential communication between tens of millions of people and is being increasingly used as a tool for security becomes a tremendously important issue to deal with, So it is important to deal with it. There are many aspects to security and many applications, ranging from secure commerce and payments to private communications and protecting passwords. One essential aspect for secure communications is that of cryptography. But it is important to note that while cryptography is necessary for secure communications, it is not by itself sufficient. Cryptography is the science of writing in secret code and is an ancient art; In the old age people use to send encoded message which can be understand by the receiver only who know the symbolic and relative meaning of that encoded message .The first documented use of cryptography in writing dates back to circa 1900 B.C. Egyptian scribe used non-standard hieroglyphs in an inscription. After writing was invented cryptography appeared spontaneously with applications ranging from diplomatic missives to war-time battle plans. It is no surprise, then, that new forms of cryptography came soon after the widespread development of computer communications. In telecommunications and data cryptography is necessary when communicating in any untrusted medium, which includes any network, particularly the Internet [1].Within the context of any application-to-application communication, there are some security requirements, including:
Due to the demand for the internet to be fast, networks are designed for maximum speed, rather than to be secure or track users (“Interpol” par. 1). The adage of the adage.... ... middle of paper ... ...