Welcome!

As of Dec 2023, I have returned to Amazon.

From 2021 to 2023, I was a SWE at Google.

From 2011 to 2021, I was a software engineer at AWS, doing cloud security.

From 2004 to 2011 I was involved in secure voting technologies (end-to-end verifiable systems in particular), as part of the Scantegrity and PunchScan projects. I also worked as a consultant for NIST on voting standards, Internet voting and end-to-end technologies.

I have a Ph.D. in computer science from The George Washington University., with the thesis A Framework for Secure Mixnet-Based Electronic Voting (Advisers: Poorvi Vora and David Chaum). I also have a B.S. diploma in computer science and engineering from "Politehnica" University of Bucharest, Romania.

Select publications (Complete list of papers):

1. Scantegrity II Municipal Election at Takoma Park: The First E2E Binding Governmental Election with Ballot Privacy
   Richard Carback, David Chaum, Jeremy Clark, John Conway, Aleksander Essex, Paul S. Herrnson, Travis Mayberry, Stefan Popoveniuc, Ronald L. Rivest, Emily Shen, Alan T. Sherman, Poorvi L. Vora
   USENIX Security
   Washington D.C., August 2010
2. Explaining the PunchScan voting system
   Stefan Popoveniuc, Ben Hosp
   Towards Trustworthy Elections: New Directions in Electronic Voting
   Springer LNCS 6000, ISBN: 978-3-642-12979-7, June 2010
3. Scantegrity: End-to-End Verifiability for Optical Scan Elections
   David Chaum, Richard Carback, Jeremy Clark, Aleksander Essex, Stefan Popoveniuc, Ronald L. Rivest, Peter Y. A. Ryan, Emily Shen, Alan T. Sherman, Poorvi L. Vora
   IEEE Transactions on Information Forensics and Security: Special Issue on Electronic Voting.
   Volume 4, Pages: 611-627, December 2009
4. Scantegrity: End-to-End Voter-Verifiable Optical-Scan Voting
   David Chaum, Aleks Essex, Richard Carback, Jeremy Clark, Stefan Popoveniuc, Alan Sherman, Poorvi Vora
   IEEE Security and Privacy
   Vol. 6, No. 3, Pages 40-46, May/Jun 2008
5. SpeakUp: remote unsupervised voting
   Stefan Popoveniuc
   ACNS 2010, industrial track
   Beijing, China, June 2010
6. Performance requirements for End-to-End Verifiable elections
   Stefan Popoveniuc, John Kelsey, Andrew Regenscheid, Poorvi Vora
   EVT 2010
   Washington D.C., August 2010
7. Sigma Ballots
   Stefan Popoveniuc, Andrew Regenscheid
   EVOTE 2010
   Bregenz, Austria, July 2010

The voting projects I have been involved in have been covered by the media: The Economist, Discover Magazine, The Washington Post The Washington Times, MSNBC, NPR, BBC, Voice of America, Communications of the ACM, IEEE Spectrum, Wired, Popular Mechanics (A more complete list of media articles)

Fun:

1. Erdős Number: 3 (via Ronald L. Rivest, David Avis, Paul Erdős)
2. H-Index: 14