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Denial of service attacks case study
Internet privacy and security issues
Internet privacy and security issues
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Internet technology has extended to greater degree than it is believed to be. It has become an inevitable part of our lives and we rely totally on the internet for our daily necessities. Internet is a highly unbounded vast network of networks. As Internet keeps growing, there are new threats evolving thus increasing the need to develop and tighten security measures to ensure the protection of it. There are many challenges faced by Internet, Distributed denial of Service is the critical concern for Internet, particularly to internet commerce. Distributed Denial of Service attacks can cause infrastructure problems and can disrupt communications on international level. Access denial to information by attacking the network in illicit way has become common nowadays. In this paper, we will discuss about how to detect and defend network service from the Denial of Service (DioS) and Distributed Denial of Service attack (DDioS).
First, let’s look into what is Distributed Denial of Service attack. DDioS attack is illegal attempt by a single system or a group of people to cause the network site to deny service to its users. DDioS attacks exhaust the victim’s server resources and prevent the victim server from providing service to legitimate users. DDioS attack uses many different network connections and multiple botnets to crash the system or server. During the DDoS attack, users sometimes numbering in the hundreds or even thousands overwhelm a website’s host server with connection requests, slowing the website to a crawl or even causing it to crash entirely. The best way to defend these kinds of attacks is to detect them before it crashes the system (i.e. network service) or while the attack is undergoing. There are several methods ava...
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...ess and egress. With this information, port-flows are tagged, prioritized and URL determines what specific limit rates are. The URL is deployed on the routers and this monitors the inflow and outflow of packets through the routers in the view of ingress and egress. Based on the traffic pattern extracted and the port flow aggregation, the port-flows are prioritized. Then the limiting rates are calculated for each port-flow. Based on the prioritization, the port flows traffic is suppressed and congested links are brought to upper limit bandwidth to mitigate the DDioS attacks. To sum up, in this technique traffic increasing patterns are analyzed. Then the traffic aggregates are prioritized and divided into subsets based on the pattern extracted. After that traffic aggregate that includes DDioS attack is suppressed to greater degree which mitigates the DDioS attack.
In order to protect the application servers from the internet, the most common un-trusted network, the proposal suggests a firewall to be installed between the internal network and external router. The firewall would be an Adaptive Security Appliance (ASA) firewall, "the ASA is not just a pure hardware firewall. In brief, the Cisco ASA is a security device that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities. It provides proactive
Lab 1 demonstrates the capabilities of congestion control algorithms implemented by Transmission Control Protocol (TCP). It provides three scenarios to simulate these algorithms and will later compare the results.
Watch Guard Fireware has a firewall based IPS the can detect and block of attacks in the proxy policies. When enabling Firebox, this will protect the network from any kind of attack especially zero day threats from the outside world. Also, the IT staff should use a signature-based Intrusion prevention system to that is good for maintaining efficiency and performance protection on the network. Using my suggestions will prevent any more threats in the future for these web servers on the college’s
“The hearts and mind (HAM) theory is identified as winning the hearts and minds of the population which is a technique based on the implementation of the counter-insurgency (COIN) strategy of persuading the population to support the government and reject the insurgents.” The counter-insurgency (COIN) strategy as outlined by President Obama and General Petraeus’s most closely embrace is the heart and minds (HAM) theory. President Obama speech identified the United States strategic approach with Afghanistan in three elements. The three core elements addressed by President Obama during his speech on the strategy in Afghanistan are identified as: 1) utilize the military effort to create conditions for transition, 2) a civilian surge that reinforce positive actions, and 3) an effective partnership with Pakistan.” These elements align with the premise of HAM and the strategy of COIN. Furthermore, in General Petraeus’s COIN strategy he specifically shifts the focus from the enemy and toward the empowerment of the Afghanistan population and its government.
When it comes to protecting an infrastructure, careful planning and coordination needs to take place. Protecting an infrastructure takes an important security initiative called Critical Infrastructure Protection (CIP). The United States critical infrastructure is protected by the Department of Homeland Security.
Network Security is the protection of the computer’s network though out the entire infrastructure. It can protect very important information and computer files to help prevent theft, spyware, malware, viruses, and more. Depending on if you have a public or private network, can determine what type of security settings you need for your network. All people are different on what they want to have secured or not, but most people do not know how to prevent people or things from getting in their network. “You must have a general understanding of security terminology and specifications as it relates to configuring hardware and software systems.”(Roberts, Richard M. 599). That quote states that by knowing and understanding security terms and specifics, you can
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.
Many nations in the world - the United States, China, Russia, Iran, Germany, and more- use cyber warfare as a method of conducting sabotage and espionage. Nations, such as China and Russia, use espionage in order to prevent their economy and their military technology from falling behind by stealing advanced nations’ technology. Other nations, including Israel and Iran, focus on sabotaging other nations to cripple them, by sending malwares that destroy important data on the system, from advancing their technology and costing them a decent amount of money due to repairs. Another popular cyber attack used, mainly with hacktivist, government- sympathetic groups not owned by the government, and nations less advanced in technology, is Denial-of-service, or DoS. DoS is used to hinder the target’s website and other things that are maintained by computers by making it unavailable to intended users. People argue there are no benefits for cyber warfare due to its potential destructive powers and instant process of destruction. While other people-looking from a different view find that cyber warfare does have its benefits. They argue that an important benefit is that cyber warfare takes place in cyber space meaning that it does not physically harm people. They also argue that cyber warfare draws the awareness of the nation on the ever increasing dangers of cyber warfare and forces the government to set up stronger cyber security to fend off international attacks, which also help protect the government from internal hackers. It also creates more jobs for hackers, who use their knowledge to increase the security instead of harm it. Although cyber warfare produces damaging effects on a nation, in the long run, it crea...
One issue which could plague Internet Key Exchange is the clogging attack. The clogging attack occurs when an attacker uses forged IP addresses to initiate many (thousands) connections which stay in the open state for a period of time, which ties up the target system’s resources. To combat the clogging attack the Cookie Exchange was adopted from the Photuris
...ng it, crashing it, jamming it, or flooding it. Denial of service is impossible to prevent because of the distributed nature of the network: every network node is connected via other networks, which in turn connect to other networks. A firewall administrator or ISP has control of only a few of the local elements within reach. An attacker can always disrupt a connection "upstream" from where the victim controls it. In other words, someone who wants to take a network off the air can either take the network off the air directly or take the network it connects to off the air, or the network that connects to that network off the air, ad infinitum. Hackers can deny service in many ways, ranging from the complex to the brute-force.
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...
The screened host firewall combines a packet-filtering router with an application gateway located on the protected subnet side of the router.gif The application gateway needs only one network interface. The application gateway's proxy services would pass TELNET, FTP, and other services for which proxies exist, to site systems. The router filters or screens inherently dangerous protocols from reaching the application gateway and site systems. It rejects (or accepts) application traffic according to the following rules:
A firewall is a network device, hardware, software, or a combination of the two, whose purpose is to enforce a security policy across its connections. It is comparable to a wall that has a window where the wall serves to keep things out, except those permitted through the window. A security policy acts like the glass in the window; it permits some things to pass, light, while blocking others, air. The heart of a firewall is the security policy that it enforces.
The internet offers high speed connectivity between countries, which allows criminals to commit cybercrimes from anywhere in the world. 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). This lack of security enables hacker...