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Recently, a word of the security is often used in the press; however, the word of the security has ambiguity. So, a unique definition of the security and conditions to realize the security are revealed from the engineering aspect. We also discuss how the on-line security systems, so-called, form the security from the view of the definition and the conditions. In addition, relationship between the security and the risk management including the risk control and the crisis management is described from the same view point.