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In this thesis we will focus on Functional Encryption. At first a wide range of different types of requirements and applications which are not fulfilled by Public-Key Encryption are considered. These types of requirements finally led us to Functional Encryption. Then a breaf explanation of differrent types of Functional Encryption is presented. In the sequel we will exlain Functional Encryption more formally. Finally we will consider the latest achievemnets and open problems in this area  

One of the most important steps in the process of network forensics is attacker attribution and tracing the victims of the attack. In some situations, there is no other information to track the attacker except the payload of packet. Network security professionals have introduced payload attribution techniques to attribute this type of attacks. In payload attribution techniques, a history of network traffic is stored so that after the attack, it can be queried to trace the source and destination of excerpts. Due to the high volume of traffic in today's networks, payload attribution techniques should be able to store traffic in compressed format so that querying on this data be done easily at...