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At the core of the cloud is a set of computing, networking, and storage services—governed and offered by an “infrastructure as a service” cloud service provider (CSP). In many cases, these resources are provided in a virtualized format to enable greater elasticity and flexibility.
Today’s virtualization technologies are enablers for better and more flexible security on the cloud platform. These technologies specifically deliver better resiliency and easier disaster recovery—both of which impact the availability of cloud services. Plus, they enable the use of security virtual machines that can provide isolated virtual security appliances.
However, a cloud can also build on classical non-virtualized computing, networking, and storage services. Going forward, the majority of enterprise clouds are expected to be hybrid clouds made up of a combination of both virtualized and non-virtualized IT resources.
All IT resources—physical and virtualized—on the CSP side must be equipped with the security services that we discussed above for the client access device. These include malware and data protection measures, as well as network and host security solutions. In addition, when virtualized resources are used, CSPs may also need a set of security solutions tailored to protect the virtualization layer.
Again, these include special malware protection, IDS/IPS, firewalls, and networking protection software. Preferably, CSPs must also use a security management solution that can span both the physical and virtualized elements of the IT infrastructure.
If a CSP offers services to different tenants—different cloud consumers, organizations, or organizational departments—with strict data privacy or confidentiality requirements, then the cloud platform must also adhere to multi-tenancy isolation requirements. Multi-tenancy creates additional security challenges to guarantee that the different tenants’ data are isolated while they are processed, transmitted, or stored on the shared cloud infrastructure.
While providing services such as “platform as a service” (PaaS) or “software as a service” (SaaS), additional security services must be deployed to cope with specific application-level and application-data-level threats.
These include services to provide application‑level hardening, denial‑of‑service protection, application-level data encryption, and integrity protection. In the case of PaaS, service providers must also provide tools that can help ensure secure software development and deployment.
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