Question: A Symmetric PIR scheme ( henceforth SPIR ) is a PIR scheme where, at the end, Alice learns nothing more than xi . We will

A Symmetric PIR scheme (henceforth SPIR) is a PIR scheme where, at the end, Alice learns nothing more than xi
.
We will allow the databases to share a common random string; however, the length of that string will be one of our
parameters.
1. Describe the CPIR protocol based on the quadratic residue assumption. Why does the protocol work?

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