Radhika B Patel,

Wireless sensor network security is a big field. You should specify, what kind of help do you need. To learn about the latest research on the field, just go to scholar.google.com. Download some latest research articles on your field. Study these articles one by one. Follow my 5 steps methodology. (1) Just thoroughly read an article. Mark the points/terms that you do not understand. However, do not spend time by waiting at these points. (2) After completing your reading, go to google. Make yourself clear on these points/terms by searching in the google. (3) Again read that article with deep concentration. Make every step of the algorithm clear. (4) Start further reading that article. Now try to find some points for your criticism. (5) Pick the send article and repeat the steps 1-4. I am sure, you will be clear about the scenario of that research field. Even, you will be a good researcher on the field. Follow my therapy.