Proofs that yield nothing but their validity and a Methodology of Cryptographic protocol design

Knowledge complexity of interactive proof systems

"Most persons are so absorbed in the contemplation of the outside world that they are wholly oblivious to what is passing on within themselves."― Nikola Tesla

A Survey of Zero-Knowledge Proofs with Applications to Cryptography

Great intro on original ZKP protocols

How to construct zero-knowledge proof systems for NP

Classic paper by Goldreich, Micali and Wigderson

Information Theoretic Reductions among Disclosure Problems

Brassau et al