We address the problem of providing
users with the ability to assess the integrity of join results produced by
external computational providers and computed over externally stored databases.
Our approach relies on different mutually supporting techniques offering strong
integrity protection guarantees at a limited cost. The application of the
approach is completely transparent to the computational provider, against which
data and query confidentiality are preserved. The paper introduces our
techniques analytically, examining their protection guarantees and performance.
It also illustrates experimental results, which confirm the effectiveness and
efficiency of our solutions.
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