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A systematic review of secure coded caching
No full textIn a content delivery network (CDN), resources are strained during peak-time and un-
derutilised in off-peak times when supplying digital content to users. Caching can help
balance this. At the off-peak time some content is delivered to users’ local caches. During
peak time, the use of cached data to serve users’ requests relieves strain on the network
by reducing repeated transfer of popular content. In coded caching, the cache content
placement is designed in conjunction with the delivery techniques to optimise network
throughput.
Since dissemination of information, as well as the delivery of entertainment, is reliant
on CDNs, the security and privacy of cache placement, user demand, and content delivery,
are paramount. In much of the literature in secure coded caching, security is built on top of
solutions that have efficiency in mind, and most current proposals focus on the security of
individual parts of the process. A lack of a unifying network model also makes it difficult
to compare or combine solutions.
In this survey we analyse the security and privacy requirements of secure coded
caching, and evaluate existing schemes in terms of the security provided and the cost
of this security provision. We also review the techniques used to achieve secure coded
caching and analyse their limitations. In addition, we contextualise secure coded caching
in the landscape of other secure content delivery primitives. As a result, we identify and
prioritise open security and privacy challenges for the future
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