There seems to be a lot of confusion about security fundamentals of cloud computing (and other utility-based approaches). For example, many people erroneously think hardware virtualization is required for clouds (it is not), or that hardware virtualization and containerization are the same (they are not).
My essay Cloud Security: Virtualization, Containers, and Related Issues is my effort to counteract some of this confusion. It has a quick introduction to clouds, a contrast of various security isolation mechanisms used to implement them, and a discussion of some related issues.
So please check out (and enjoy) Cloud Security: Virtualization, Containers, and Related Issues.
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