Round complexity is one of the fundamental problems in zero-knowledge (ZK) proof systems. Non-malleable zero-knowledge (NMZK) protocols are ZK protocols that provide security even when man-in-the-middle adversaries interact with a prover and a verifier simultaneously. It is known that the first constant-round public-coin NMZK arguments for NP can be constructed by assuming the existence of collision-resistant hash functions (Pass, R. and Rosen, A. (2005) New and Improved Constructions of Non-Malleable Cryptographic Protocols. In Gabow, H.N. and Fagin, R. (eds) Proc. 37th Annual ACM Symposium on Theory of Computing, Baltimore, MD, USA, May 2224, 2005, pp. 533542. ACM) and has relatively high round complexity; the first four-round private-coin NMZK arguments for NP can be constructed in the plain model by assuming the existence of one-way functions (Goyal, V., Richelson, S., Rosen, A. and Vald, M. (2014) An Algebraic Approach to Non-Malleability. In 55th IEEE Annual Symposium on Foundations of Computer Science, FOCS 2014, Philadelphia, PA, USA, October 1821, 2014, pp. 4150. IEEE Computer Society and Ciampi, M., Ostrovsky, R., Siniscalchi, L. and Visconti, I. (2017) Delayed-Input Non-Malleable Zero Knowledge and Multi-Party Coin Tossing in Four Rounds. In Kalai, Y. and Reyzin, L. (eds) Theory of Cryptography15th Int. Conf., TCC 2017. Lecture Notes in Computer Science, Baltimore, MD, USA, November 1215, 2017, Part I, Vol. 10677, pp. 711742. Springer). In this paper, we present a six-round public-coin NMZK argument of knowledge system assuming the existence of collision-resistant hash functions and a three-round private-coin NMZK argument system from multi-collision resistance of hash functions assumption in the keyless setting.

Canetti, Lin and Paneth in TCC 2013 showed a O>(log1+εn) rounds public-coin concurrent zero-knowledge argument system (CZK) based on the existence of collision resistant hash functions, which is currently known as round optimal public-coin CZK from standard assumptions. In this paper, we further address this problem and present an alternative construction of public-coin CZK argument system with succinct slot. The key technique involves a new variant of Barak’s non-black-box simulate approach. In particular, the original protocol uses n commitments in each slot, while our construction uses one commitment in each slot. Through our simulation techniques, the simulator recovers any previous state needed for the probabilistically checkable proof (PCP) from the current committed state, which, in our view, may be of independent interest. Furthermore, the public-coin CZK argument system can be transformed into a resettable security protocol based on the one way functions assumption. Therefore, we present a new construction of the simultaneous resettable zero-knowledge argument system.

Concurrent non-malleable zero-knowledge (CNMZK) considers the concurrent execution of zero-knowledge protocols in a setting even when adversaries can simultaneously corrupt multiple provers and verifiers. As far as we know, the round complexity of all the constructions of CNMZK arguments for NP is at least ω (log n ). In this paper, we provide the first construction of a constant-round concurrent non-malleable zero-knowledge argument for every language in NP . Our protocol relies on the existence of families of collision-resistant hash functions , one-way permutations and indistinguishability obfuscators . As an additional contribution, we study the composition of two central notions in zero knowledge, the simultaneously resettable zero-knowledge and non-malleable zero-knowledge , which seemingly have stronger proved security guarantees. We give the first construction of a constant-round simultaneously-resettable non-malleable zero-knowledge . To the best of our knowledge, this is the first study to combine the two security concepts described above together in the zero-knowledge protocols.

Load-balancing is an important technology for improving performance of distributed system. We are based on the analysis of distributed process communication protocol, then we design a load balancing solution for the automation deployment and monitoring system , in order to solve the big communication load problem when the control center directly send messages to the large number of clients and the bottleneck that the number of client controlled by center cannot beyond the upper limit of the machine port, we design a resource scheduling strategy and puts forward the concept of communication layer proxy, then using two methods the subnet mask algorithm and consistency hash algorithm to realize the communication layer proxy. Through the experimental results show that the plan effective solve this two questions and with a good load uniformity and a little damage of remapping.