He is a Research Professor at Georgetown University, specializing in cryptography and security. His work began in 1997 with the Bank of Japan's electronic cash project. He served in the SHA- Competition process and held a world record for solving DLP for elliptic curve cryptography. He was a Project Editor for ISO standards on secret sharing and cryptographic protocol security. As Co-Chair of BGIN, he leads standardization for Blockchain. He is a member of the Cryptoasset Working Group at JFSA.