Twitter's Denial of Service Attack
There has been much analysis of Twitter's recent DofS hacker attack that brought down its servers for a few hours. DofS attacks are one of the most common types of hacker attack and have been for years. So most high profile sites have installed software or otherwise engaged protection from them. There are lessons to be learned from the Twitter attack. For some businesses, and outage of their IS service for several hours can be disastrous and cost them customers and a great deal of business and money. Prevention is paramount and strong preventive measures need to be in place. For a quick analysis of the Twitter attacks, check out this article in CIO Magazine. Also, for a more detailed view of Dof S attacks, the Wikipedia article is worth a look. Finally, CERT has an archived document that is quite informative.