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In Security-as-a-service model the focus is on security provided as cloud services; i.e. security delivered through the cloud instead of on-premise security solutions. The securityas-a-service model can also enhance functionality of existing on-premise implementations by working as a hybrid solution. The paper provides the comprehensive analysis of security-asa-service delivery model from various perspectives. The paper addresses various issues regarding security delivered as cloud service. This paper addresses various questions that may arise regarding security-as-a-service viz. definition of security-as-aservice, its need, different security services currently available, different providers of same, different users and likely users of this service, various evaluation criterions for security-as-a-service solutions and implementation methods of such solutions.

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