Semantic Web attacks and countermeasures

Semantic Web is extension to World Wide Web. It has different types of applications which need security and privacy. As cyber attacks are increasing day by day, security becomes the critical issue in Semantic Web. In this paper, we have discussed attacks on Semantic Web. We have described the various categories of the attacks like XML attacks, Semantic Web Service attacks, Semantic Web injection attacks, trust attacks etc. We have also discussed their countermeasures.