On the commercial side, we have experienced a denial-of-service attack related to the marketing vendor.
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That means they could be used to launch a distributed denial-of-service attack on a victim's computer.
Gox, a Tokyo-based exchange that handles roughly 80% of Bitcoin trading, recently shut down briefly after a denial-of-service attack.
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He later posted a link to instructions on how to execute a simple denial-of-service attack on a Web site.
The distributed denial-of-service attack failed to crash those payment networks, but David says Anonymous did manage to poke around their back-end computer systems.
Spamhaus accused Cyberbunker, a Dutch Web-hosting company, of coordinating the so-called distributed denial-of-service attack against it, according to a report by the British Broadcasting Corp.
Using the handle Flashboy, Ternovskiy soon mastered the art of the denial-of-service attack, wherein a target system is paralyzed by a mass of incoming communication requests.
However, the BBC was later told that experts had concluded it was not a denial-of-service attack, of the kind South Korea has experienced in the past.
Hanna said Spamhaus experienced its first denial-of-service attack in 2003.
The courts have yet to decide who is liable if a computer system with lax security is used to launch a denial-of-service attack, but a number of lawsuits are pending.
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Twitter said the site's blackout was caused by a "denial-of-service attack, " which likely means a hacker used a number of infected computers to send enough automated requests to the site to overwhelm it.
This sudden surge of requests, which were cancellations for a large batch of orders that the machine had never actually sent out, acted like a denial-of-service attack on some parts of the New York Stock Exchange.
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But the trick could be scaled up to hundreds or thousands of fake signals, much like a denial-of-service attack that uses thousands of computers to choke a website with a flood of fraudulent requests for information, Costin says.
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Rouland points out that ISS Tuesday discovered a chat room called "IP Victims" on Yahoo that is being used for the exchange of IP addresses of machines compromised by the Trojan horse Back Orifice and an older distributed denial-of-service attack tool called Sub Seven.
In a tweet on its Twitter feed, MTGox said it was fighting off a distributed denial-of-service (DDoS) attack, which involves a site being bombarded with huge amounts of data.
One of the Internet Protocol (IP) addresses used to break into Nonghyup's system was the same as one used in March for a distributed denial-of-service (DDoS) attack that originated in North Korea, they added.
This so-called Distributed Denial of Service (DDoS) attack relies on having enough users, voluntary or not, to flood a site with so much traffic that it gets shunted offline.
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Doing so requires that you take some offensive action - send out hostile applets, return fire with your own denial-of-service tools or anything else that will shut down the attack.
Either number would be far larger than the more primitive denial of service attack that hit WikiLeaks on Sunday, prior to its publication of a quarter-million diplomatic cables leaked from the U.S. State Department.
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