Matthew Daniel Green is an expert in applied cryptography and network security. He is an Assistant Research Professor of Computer Science at Johns Hopkins University. He specializes in applied cryptography, privacy-enhanced information storage systems, anonymous crypto-currencies and digital rights management systems. Dr. Green is a member of the teams that developed the Zerocoin and Zerocash anonymous crypto currencies. He has also been involved in the groups that exposed vulnerabilities in RSA BSafe, Mobil Speedpass and EZpass toll collection systems.