The
use of cloud computing has increased rapidly in many organizations. Cloud
computing provides many benefits in terms of low cost and accessibility of
data. Ensuring the security of cloud computing is a major factor in the cloud
computing environment, as users often store sensitive information with cloud
storage providers but these providers may be untrusted. Dealing with “single
cloud” providers is predicted to become less popular with customers due to
risks of service availability failure and the possibility of malicious insiders
in the single cloud. A movement towards “multi-clouds”, or in other words,
“interclouds” or “cloud-ofclouds” has emerged recently.
This
paper surveys recent research related to single and multi-cloud security and
addresses possible solutions. It is found that the research into the use of
multi cloud providers to maintain security has received less attention from the
research community than has the use of single clouds. This work aims to promote
the use of multi-clouds due to its ability to reduce security risks that affect
the cloud computing user.
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