Grid computing is a distributed network in which several processors distributed globally and sharing the computational resources to solve various problems. Security in every network is now a must and important part for the successful communication in network. Normally network security is at much higher level on outer part of the network than the inside part. This property of security sometime can act as hot cake for network intruders. Insider attacks combined with various worm attacks could prove to be the bottleneck and disaster for network. There is need of optimized approaches to handle such security issues.