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Internet security is the topic of this paper. Software as a service (SaaS) is a well-established, cost-effective means to deliver traditional software applications without investing in infrastructure and qualified personnel. A natural extension of cloud services is to extend platform independence via virtualization to a security model. This paradigm allows for the distributed provisioning of common security services. This model and its application demonstrate the viability of "security as a service" for cloud computing. Security as a service can enable cloud customers to implement and maintain the protection they need in an efficient, cost-effective manner that can be tailored to meet their risk profile. The paper discusses the aspects of security as a service.