With the development of information technology and attention of energy reservation, more and more people and organizations are interested in working virtually. However, security is one of important challenges for virtual working since sensitive data is transmitted and stored online. In this paper, we propose a novel solution as a security service on cloud computing platform to protect virtual working with on-demand virtual private network (VPN) as well as transparent encryption. Advantages of the solution are on-demand, easy to use, cost effective and simple management. It can also save expenditure for small and medium-sized enterprises which needn’t invest IT systems to set up their own security solution for virtual working.