"There was a DDoS attack, but no damage was done, " said an official from the presidential office.
In a DDoS attack, multiple servers send simultaneous requests to the target's Web servers, ultimately causing them to crash.
Performing the DDoS attack three times, with our bots constantly trying to access the site, was enough to take it down.
In a DDoS attack, computers flood a website with requests, overwhelming its servers and causing it to crash or become inaccessible for many users.
The group also defaced government Web sites including this one, which is currently down due to be subject to a DDoS attack.
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Do-it-yourself DDoS attack tools are readily available and easy to use.
The last video revealed further divisions within the hacktivist group, announcing that some members of the group still planned to carry out a DDoS attack on NYSE.com.
The closest equivalent to a DDOS attack in the offline world would be a mass sit-in or a mob milling around a building, making entry and exit impossible.
The hacker executes a DDoS attack by telling all the computers on his botnet the network of zombie computers to contact a specific server or Web site repeatedly.
Last year PayPal was able to track down around 1, 000 IP addresses of people who had participated in a DDoS attack on its site because they had used the old LOIC.
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Last year, when a Web site launched by infamous hacker group LulzSec was knocked offline by a massive DDoS attack it turned to CloudFlare, a 30-person San Franicisco start-up for protection.
"If you visit the webpage, and do not have Javascript disabled, you will instantly, without user interaction, begin to flood a website of Anonymous's choice with unwanted traffic, helping to perpetuate a DDoS attack, " it said.
The DDoS attack directed at servers run by Spamhaus came at a rate of 300 gigabits a second, which is five or six times the intensity of typical cyberattacks against banks, said Dan Holden, director of security research at Arbor Networks Inc.
Spamhaus servers were hit with a huge amount of data via an attack technique known as a Distributed Denial of Service (DDoS) attack.
This is a Distributed Denial of Service (DDoS) attack, and it is well within the capabilities of a botnet.
It appears the site suffered from a Distributed Denial of Service (DDoS) attack over the course of Tuesday and Wednesday.
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.
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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The UK Serious Organised Crime agency took its website offline for several hours on 20 June after it appeared to be a victim of a distributed denial of service (DDoS) attack.
If the Twitter handle really is behind the outrage, via what he claims was a distributed denial of service (DDoS) attack coordinated by public and private bot scripts, his motivations are unclear.
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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.
The group said it had used a distributed denial of service attack (DDoS) which bombards a target website with so much data that it becomes overwhelmed.
He will not face trial on another count of operating a "denial of service attack" (DDoS), which will lie on file.
Security experts say the attack uses more sophisticated techniques than most DDOS (distributed denial of service) attacks and targets the Web's infrastructure, which has led to other sites performing slowly.
Arbor Networks, a firm which specialises in protecting against DDoS attacks, also said it was the biggest such attack they had seen.
BBC: Global internet slows after 'biggest attack in history'
They face more serious accusations that include hacking into the servers of Sony Pictures and PBS, DDoS-ing the website of the CIA and carrying out a devastating attack on cyber security firm HBGary Federal in February 2011.
Security experts said the attack used more sophisticated techniques than most distributed denial of service, or DDoS, attacks and targeted the Web's infrastructure, which led to other sites performing slowly.
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