David is an expert in cryptography and network security who is engaged in both theory and practice. He was instrumental in the development of several standards, including the Galois/Counter Mode (GCM) of operation high speed authenticated encryption algorithm, and Secure RTP, the industry standard protocol for encrypted voice and video. David has authored several research results and holds 17 patents. He is currently chair of the Internet Research Task Force (IRTF) Crypto Forum Research Group, and is active in the Internet Engineering Task Force (IETF).
David works in Cisco's Corporate Security Programs office. Previously, he managed Cisco's Advanced Crypto Development Group, which pioneered the technologies used in Dynamic Multipoint VPN and Group Encrypted Transport VPN. From 1998-2000, he managed Cisco's IOS Virtual Private Network development team, and before joining Cisco, he was a Cryptographic Scientist at Trusted Information Systems. He holds a Ph.D. in Physics.