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Zero-knowledge proofs are extremely useful constructs. Their fascinating nature is due to their seemingly contradictory definition. Their applicability in the domain of cryptography is vast.
A fundamental question regarding zero-knowledge protocols is whether their security is preserved when many instances of the protocol are executed concurrently. This question is also interesting from a theoretical viewpoint - in addition to being challenging from an algorithmic perspective, the study of zero-knowledge in the concurrent setting has contributed greatly to our understanding of the concurrent security of cryptographic protocols.
Protocols that remain zero-knowledge when many instances are executed concurrently are called concurrent zero-knowledge, and this book is devoted to their study. The book presents constructions of concurrent zero-knowledge protocols, along with proofs of security. It also shows why "traditional" proof techniques (i.e., black-box simulation) are not suitable for establishing the concurrent zero-knowledge property of "message-efficient" protocols. The book features introductory and concluding chapters on zero-knowledge by Oded Goldreich.