Cyber-security of digital industrial control system in reality is complex and challenging research area, due to various interconnections of electro-mechanical related components driving national critical infrastructures. These networked system components performs monitoring and controlling tasks in several industries and organization through the access of Internet connectivity across the world. More recently, there are myriad of security threats and attacks by malicious elements on ICS which now presents a priority to organizations and researchers for optimal security solutions. Development of the Internet and communication systems has also exacerbated such security concerns. Activities of cyber-attacks malicious elements on ICS may result in serious disaster in industrial environments, human casualties and loss. This paper critically looks at the SCADA/industrial control systems, architecture, cyber-attacks. Other aspect of the paper examines current ICS security technologies including a computational secured algorithm for PLC
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