The cloud database as a service is a novel
paradigm that can support several Internet-based applications, but its adoption
requires the solution of information confidentiality problems. We propose a
novel architecture for adaptive encryption of public cloud databases that
offers an interesting alternative to the trade-off between the required data
confidentiality level and the flexibility of the cloud database structures at
design time. We demonstrate the feasibility and performance of the proposed
solution through a software prototype. Moreover, we propose an original cost
model that is oriented to the evaluation of cloud database services in plain
and encrypted instances and that takes into account the variability of cloud
prices and tenant workload during a medium-term period
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