Matthew Green is a Cryptographer and Security Technologist. Green is an Assistant Professor of Computer Science at the Johns Hopkins Information Security Institute. He specializes in applied cryptography, privacy-enhanced information storage systems, anonymous cryptocurrencies, elliptic curve crypto-systems and satellite television piracy. He is a member of the teams that developed the Zerocoin anonymous cryptocurrency and Zerocash. He has been involved in the groups that exposed vulnerabilities in RSA BSAFE, Speedpass and E-ZPass. He is a Co-Author of the paper Keys under Doormats that argues against universal encryption backdoors. Green is the Economist’s go-to source for encryption.