Sharif Digital Repository

Denial of service (DoS) attacks is the main challenges of service providers due to their purpose to makes their service unavaillable. Nowadays this attacks are changed from centralized to distributed (DDoS) by means of botnets. In addition botnets allow attackers to launch attack on higher layers of network, such as application layer. In new application layer DDoS attacks, attacker send HTTP requests to waste victims resources. In addition, attacker can start attack during flash crowd event which makes attack more undetectable. In this research, in order to migigating such attacks, we introduced a method based on user’s history.
This history consist of user’s request rate for each... 

Our country in no measure is considered as an industrial one, despite its chain of small, medium and large industries. The vague, general “developing” term might be the best term to assign to economic-industrial condition of our country. We have a fairly limited number of big industrial firms (BIF) which could continue operation without state’s supports in a world BIFs are considered as the key indices in industrial development. The question comes to mind with reading what came above is this study’s main question, “What went wrong?”. This study follows the historical approach to the question through a comprehensive case study. Historical case-study thus is our main research approach here....