Academic research based on network security

Hi,

I am actually doing my Master in Network security and i am wondering if any one can help me here to get some good dissertation topic.

Actually, i know some of the topics e.g Cloud computing security, Security in wireless network but i am seeking some topic where i can do some research based on secondary data collection. However, i need to do research for fulflling my master and it is academic based so i have limited resources.

I would be seeking here some topics where i can do research by collecting secondary data. Primary data collection require some kind of survey or lab exploratory work and i dont have all these resources. So i would be seeking topics where i can get some case study and collect data from secondary sources and do research.

Answers and responses will be appreciated.

Thanks to all.

Rikish