Your system's Antivirus should be always updated and always be online. Most of the SCADA systems are not design for security concern because of the real time scanning. However, some uses security. In addition, in security it uses strong user authentication. Every security system uses authentication, authorization, encryption, virus detection, filtration etc. However, how can you say that these are full secure? They provide a better security but if our system is not update, this security technology is nothing. So update them time to time because technologies are change time to time and new issues are generating day by day. The main concept behind the control system is to make low cost system with highly performance that is why most of the SCADA system in electricity industries still uses 8088 Intel microprocessor since 1978. Main thing is control system and security system are compatible each other. We cannot install security technology ignoring the control system configuration. Complex password technique is useful for security concern but not useful for unauthorized access and easy and weak password is easy to access. Basically vendor provide a default control system which has no password but it give opportunity to user to create password as it own choice and customer customize the control system according to its