Cloudflare Research logo
 
Christopher Wood Christopher Wood
Research Lead

Christopher Wood is a Research Lead at Cloudflare Research. Outside of Cloudflare, he is co-chair of the TLS and MASQUE working groups at the IETF, as well as the PEARG research group in the IRTF. Before joining Cloudflare, Christopher worked on transport security, privacy, and cryptography engineering at Apple, as well as future Internet architectures at Xerox PARC. His interests lay at the intersection of network protocol design, communications security, privacy, and applied cryptography. At Cloudflare, he leads projects focused on security and privacy enhancements to a variety of systems, protocols, and applications. Christopher holds a Ph.D. in computer science from UC Irvine.

Research Areas

Networking, Cryptography, Privacy, Security

Projects

Publications

2023Security Analysis of Signature Schemes with Key Blinding

Edward Eaton, Tancrède Lepoint, Christopher A. Wood

2023RFC 9380: Hashing to Elliptic Curves

Internet Research Task Force (IRTF). 2023.
Armando Faz-Hernández, Sam Scott, Nick Sullivan, Riad S. Wahby, Christopher A. Wood

2023Password-Authenticated TLS via OPAQUE and Post-Handshake Authentication

Julia Hesse, Stanislaw Jarecki, Hugo Krawczyk, Christopher A. Wood

2023Post-Quantum Privacy Pass via Post-Quantum Anonymous Credentials

Guru-Vamsi Policharla, Bas Westerbaan, Armando Faz-Hernández, Christopher A. Wood

2023Evaluating practical QUIC website fingerprinting defenses for the masses

The 23rd Privacy Enhancing Technologies Symposium (PETS), July 10-15, Lausanne, Switzerland. 2023.
Sandra Siby, Ludovic Barman, Christopher A. Wood, Marwan Fayed, Nick Sullivan, Carmela Troncoso

2023Hot Topics in Security and Privacy Standardization at the IETF and Beyond

IEEE Security & Privacy (Volume: 21, Issue: 2, March-April 2023).
Christopher A. Wood

2022This is not the padding you are looking for! On the ineffectiveness of QUIC PADDING against website fingerprinting

IETF 113 Conference. 2022.
Ludovic Barman, Sandra Siby, Christopher A. Wood, Marwan Fayed, Nick Sullivan, Carmela Troncoso

2022RFC 9180: Hybrid Public Key Encryption

Internet Research Task Force (IRTF). 2022.
Richard Barnes, Karthik Bhargavan, Benjamin Lipp, Christopher A. Wood

2022RFC 9258: Importing External Pre-Shared Keys (PSKs) for TLS 1.3

Internet Engineering Task Force (IETF). 2022.
David Benjamin, Christopher A. Wood

2022A Symbolic Analysis of Privacy for TLS 1.3 with Encrypted Client Hello

ACM Conference on Computer and Communications Security (CCS) 2022, November 7-11, Los Angeles, U.S.A. 2022.
Karthikeyan Bhargavan, Vincent Cheval, Christopher A. Wood

2022RFC 9257: Guidance for External Pre-Shared Key (PSK) Usage in TLS

Internet Engineering Task Force (IETF). 2022.
Russ Housley, Jonathan Hoyland, Mohit Sethi, Christopher A. Wood

2022RFC 9230: Oblivious DNS over HTTPS

Internet Engineering Task Force (IETF). 2022.
Eric Kinnear, Patrick McManus, Tommy Pauly, Tanya Verma, Christopher A. Wood

2022Might I Get Pwned: A Second Generation Compromised Credential Checking Service

31th USENIX Security Symposium (USENIX Security 22).
Bijeeta Pal, Mazharul Islam, Marina Sanusi Bohuk, Nick Sullivan, Luke Valenta, Tara Whalen, Christopher A. Wood, Thomas Ristenpart, Rahul Chattejee

2022RFC 9149: TLS Ticket Requests

Internet Engineering Task Force (IETF). 2022.
Tommy Pauly, David Schinazi, Christopher A. Wood

2022The Decoupling Principle: A Practical Privacy Framework

The 21st ACM Workshop on Hot Topics in Networks (HotNets’22), November 14–15, 2022, Austin, TX, USA
Paul Schmitt, Jana Iyengar, Christopher A. Wood, Barath Raghavan

2022Respect the ORIGIN! A Best-case Evaluation of Connection Coalescing

ACM Internet Measurement Conference 2022, October 25-27, France. 2022.
Sudheesh Singanamalla, Talha Paracha, Suleman Ahmad, Jonathan Hoyland, Luke Valenta, Yevgen Safronov, Peter Wu, Andrew Galloni, Kurtis Heimerl, Nick Sullivan, Christopher A. Wood, Marwan Fayed

2022RFC 9292: Binary Representation of HTTP Messages

Internet Engineering Task Force (IETF). 2022.
Martin Thomson, Christopher A. Wood

2022A Fast and Simple Partially Oblivious PRF, with Applications

Advances in Cryptology – EUROCRYPT 2022: 41st Annual International Conference on the Theory and Applications of Cryptographic Techniques, Trondheim, Norway, May 30 – June 3, pp. 674–705, 2022.
Nirvan Tyagi, Sofía Celi, Thomas Ristenpart, Nick Sullivan, Stefano Tessaro, Christopher A. Wood

2021Implementing and measuring KEMTLS

Progress in Cryptology – LATINCRYPT 2021, Lecture Notes in Computer Science(), vol 12912. Springer, 2021.
Sofía Celi, Armando Faz-Hernández, Nick Sullivan, Goutam Tamvada, Luke Valenta, Thom Wiggers, Bas Westerbaan, Christopher A. Wood

2021The Ties that un-Bind: Decoupling IP from web services and sockets for robust addressing agility at CDN-scale

Proceedings of the 2021 ACM SIGCOMM 2021 Conference, pp. 433–446. 2021.
Marwan Fayed, Lorenz Bauer, Vasilis Giotsas, Sami Kerola, Marek Majkowski, Pavel Odinstov, Jakub Sitnicki, Taejoong Chung, Dave Levin, Alan Mislove, Christopher A. Wood, Nick Sullivan

2021Oblivious DNS over HTTPS (ODoH): A Practical Privacy Enhancement to DNS

Proceedings on Privacy Enhancing Technologies 2021, Volume 4, pp. 575–592. 2021.
Sudheesh Singanamalla, Pop Chunhapanya, Jonathan Hoyland, Marek Vavruša, Tanya Verma, Peter Wu, Marwan Fayed, Kurtis Heimerl, Nick Sullivan, Christopher A. Wood

2020RFC 8937: Randomness Improvements for Security Protocols

Internet Research Task Force (IRTF). 2020.
Cas Cremers, Luke Garratt, Stanislav Smyshlyaev, Nick Sullivan, Christopher A. Wood

2020RFC 8922: A Survey of the Interaction between Security Protocols and Transport Services

Internet Engineering Task Force (IETF). 2020.
Theresa Enghardt, Tommy Pauly, Colin Perkins, Kyle Rose, Christopher A. Wood

Blog posts