Abstract. Security is one of the important factors in an organization’s computer network because the network
connects to other networks through the internet. An attack on the organization’s computer network can be
possible from outside of the organization. Therefore, computer network security is very important to prevent and
protect the organization from internal and external attacks. The purpose of this research is to predict the future of
computer network security for the next 5 years (2011-2015) by using Delphi technique which is a widely used and
accepted method for achieving convergence of opinion concerning real-world knowledge solicited from experts
within certain topic areas. The research result can be used to ameliorate and develop organization’s computer
network security including staff, hardware, software and privacy system