((x, n), s)
Let QR={(x,n) = x=s2 mod n}
Aliceís public Key: (x,n)
Claim: Zero Knowledge Proof of Membership [GMR86]
Claim: Parallel Repetitions are WHPOK [FFS87]
ExtractorAlice: Asks for the same R2 mod n, for both B=0 and B=1,
gets R and Rx, and computes s=Rs/R mod n
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