Brian A. LaMacchia is a computer security specialist.
LaMacchia is best known for his work at the Massachusetts Institute of Technology establishing the MIT PGP Key Server, the first key centric PKI implementation to see wide-scale use. LaMacchia wrote the first Web interface for a PGP Key Server.
LaMacchia currently works for Microsoft where he is Director of Security and Cryptography in Microsoft Research; previously he was the Director of Security and Cryptography in the Microsoft Extreme Computing Group. He played a leading role in the design of XKMS, the security architecture for .NET and Palladium. He designed and led the development team for the .NET security architecture. He was a security architect on Palladium. His most-referenced work is the .Net Framework. He designed and led the development team for the .NET security architecture.
He has played a leading role in the design of W3C XMLDsig and XKMS standards. In particular he is an author of versions 1.0, 1.1 and 2.0 XMLDsig. He is a contributor to XKMS. He is coauthor on OASIS standard WS-SECURITY.
His primary community activity is involvement with Seattle International Film Festival, where he was the treasurer until 2013, and is currently the President.