DoS/DDoS attacks are a virulent, relatively new type of Internet attacks, they have caused some biggest web sites on the world -- owned by the most famous E-Commerce companies such as Yahoo, eBay, Amazon -- became inaccessible to customers, partners, and users, the financial losses are very huge. On the other hand, if the international terrorist organizations use the DoS/DDoS to attack successfully the web sites or Internet systems of U.S. government and military, the results and losses will be disastrous and unimaginable. Therefore, for guarding both American national security and commercial security, it is really important to detecting, preventing and mitigating the DoS/DDoS attacks.
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