TAILIEUCHUNG - Network Security – Defense Against DoS/DDoS Attacks

SQL injection attacks pose a serious security threat to Web appli- cations: they allow attackers to obtain unrestricted access to the databases underlying the applications and to the potentially sensi- tive information these databases contain. Although researchers and practitioners have proposed various methods to address the SQL injection problem, current approaches either fail to address the full scope of the problem or have limitations that prevent their use and adoption. Many researchers and practitioners are familiar with only a subset of the wide range of techniques available to attackers who are trying to take advantage of SQL injection vulnerabilities. As a consequence, many solutions proposed in the literature address only some. | Network Security - Defense Against DoS DDoS Attacks Hang Chau Abstract 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 . 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. 1. Introduction 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 sometimes for up to twenty-four hours some web sites have experienced several days of downtime while trying to restore services the financial losses are very huge. From a latest important report 2003 CSI FBI 1 Computer Crime and Security Survey we know the following information about the DoS DDoS attacks in America 1. 42 percent of respondents of the survey suffered the Denial of Service DoS attacks from 1999 to 2002 only 27-40 percent of respondents suffered the DoS attacks . 2. 111 of 398 respondents reported the financial losses caused by the DoS attacks. 3. The total losses by DoS attacks was over 65 million US dollars or average losses million dollars it is the times of average losses on 2002 from 2000 to 2002 the average losses caused by the DoS attacks are only million dollars respectively . 4. In WWW Site Incidents What Types of Unauthorized Access or Misuse 35 are Denial of Service attacks. 5. In addition on the 2001 s .

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