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4-Move Perfect ZKIP for Some Promise Problems

Kaoru KUROSAWA, Wakaha OGATA, Shigeo TSUJII

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Summary :

In this paper, we consider ZKIPs for promise problems. A promise problem is a pair of predicates (Q,R). A Turning machine T solves the promise problem (Q,R) if, for every x satisfying Q(x), machine T halts and it answers "yes" iff R(x). When ¬Q (x), we do not care what T does. First, we define "promised BPP" which is a promise problem version of BPP. Then, we prove that a promise problem (Q,R) has a 3-move interactive proof system which is black-box simulation zero knowledge if and only if (Q,R) ∈ promised BPP. Next, we show a "4-move" perfect ZKIPs (black-box simulation) for a promise problem of Quadratic Residuosity and that of Blum Numbers under no cryptographic assumption.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E78-A No.1 pp.34-41
Publication Date
1995/01/25
Publicized
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Type of Manuscript
Special Section PAPER (Special Section on Cryptography and Information Security)
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