By now, most companies recognize that network security is an important aspect of daily operations, but few realize how quickly new methods of Internet attacks are being invented. While organizations rush to develop their security policies and implement even a basic security foundation, the professional hacker continues to find new ways to attack by modifying old Internet worms, Trojans, and viruses, or creating completely new ones. Recently, the attention of these hackers has reverted to Internet attacks targeted at the application layer, which can include either shrink-wrapped or custom applications. This layer is commonly the least protected layer of an organization's network. Industry experts estimate that three-fourths of the successful attacks targeting corporate networks are perpetrated via the application layer. Considering the nature of Web applications that allow access to internal and external audiences, these Internet attacks can pose a serious threat to an organization's back-end data without the organization's knowledge...
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