12月21日學術報告

報告時間：2018年12月21号下午3:00點

報告地點：計算機學院B403

報告題目：How to Securely Deploy a Blockchain: Correcting Subverted Hashes

報告人：Dr. Qiang Tang

報告摘要：Hash function is a fundamental primitive for many security applications including blockchain, password login, digital signatures and more. In this talk we focus on the basic problem of correcting faulty—or adversarial corrupted—random oracles, so that they can be confidently applied for such cryptographic purposes. We prove that a simple construction can transform a “subverted” random oracle—which disagrees with the original one at a negligible fraction of inputs—into a construction that is indifferentiable from a random function. Our results permit future designers of cryptographic primitives in typical kleptographic settings (i.e., with adversaries who may subvert the implementation of cryptographic algorithms but undetectable via black- box testing) to use random oracles as a trusted black box, in spite of not trusting the implementation. Our analysis relies on a general rejection re-sampling lemma which is a tool of possible independent interest.

報告人簡介：Dr. Qiang Tang is currently an assistant professor at New Jersey Institute of Technology (NJIT), and also a co-director of JD-NJIT-ISCAS joint blockchain lab. Before joining NJIT, he was a postdoctoral research associate at the Initiative of Cryptocurrency and Contracts (IC3) at Cornell University, under the supervision of Prof. Elaine Shi. He obtained his Ph.D from the University of Connecticut, under the supervision of Prof. Aggelos Kiayias and Prof. Alexander Russell.Dr. Tang research interests spans various topics of cryptography and blockchain technology. His research results appeared mostly in top crypto/security/distributed system venues including CRYPTO, EUROCRYPT, ASIACRYPT, CCS and more. His research was supported by NSF, DoE, JD.com, and several blockchain foundations including Protocol Labs which invented IPFS. Dr. Tang was the founding co-chair of IEEE SMC Technical Committee on blockchain and has been invited to serve as program committee on various top cryptography and blockchain venues, and as expert reviewer for various prestigious grants for funding agencies from Canada, Hong Kong and China. Dr. Tang has been invited to testify as academia representative at NJ State Congress for blockchain policies, and also a private forum for Federal policy regarding Encryption, Surveillance and Transparency.

邀請人:王骞教授