Bio

I'm a Research Professor in BU computer science focusing on privacy. I also am a Civic Tech Fellow at the Faculty of Computing and Data Sciences at BU and have an affiliation with BU's Hariri Institute. I got my PhD from Johns Hopkins University in 2020, under the supervision of my advisors Avi Rubin and Matt Green.

I am also an observant Jew and play Ultimate.

A copy of my CV is available here. A copy of my dissertation is available here.

If you came to this website expecting stuff about the placebo effect or alternative medicine, you may be looking for my father's website.

I am on the tenure track job market this year! A version of my application materials is available here. Please reach out with if you have any questions!

MPC FAQ

I have compiled an FAQ about secure multiparty computation (MPC) aimed at non-experts. The FAQ can be found here. If you notice some way in which it can be improved, please send me an email!

Teaching

Preprints

  • Speed-Stacking: Fast Sublinear Zero-Knowledge Proofs for Disjunctions
      Aarushi Goel, Mathias Hall-Andersen, Gabriel Kaptchuk, and Nicholas Spooner. [eprint PDF]
  • Safe Digital Intimacy: A Research Agenda.
      Vaughn Hamilton, Gabriel Kaptchuk, Allison McDonald, and Elissa M. Redmiles. [PDF]

Publications

(Authors alphabetical by default. Publications ordered by contribution marked with *)
  • Efficient Proofs of Software Exploitability for Real-world Processors
      Matthew Green, Mathias Hall-Andersen, Eric Hennenfent, Gabriel Kaptchuk, Benjamin Perez, and Gijs Van Laer. PoPETS 2023. [eprint PDF]
  • Stacking Sigmas: A Framework to Compose Σ-Protocols for Disjunctions.
      Aarushi Goel, Matthew Green, Mathias Hall-Andersen, and Gabriel Kaptchuk. EUROCRYPT 2022. [eprint PDF]
  • Efficient Set Membership using MPC-in-the-Head.
      Aarushi Goel, Matthew Green, Mathias Hall-Andersen, and Gabriel Kaptchuk. PoPETS 2022. [eprint PDF] [Conference PDF]
  • How good is good enough for COVID19 apps? The influence of benefits, accuracy, and privacy on willingness to adopt.*
      Gabriel Kaptchuk, Daniel G. Goldstein, Eszter Hargittai, Jake Hofman, and Elissa M. Redmiles. ACM Digital Threats: Research and Practice Special Issue on COVID-19. [Journal Version] [arXiv]
  • Fluid MPC: Secure Multiparty Computation with Dynamic Participants.
      Arka Rai Choudhuri, Aarushi Goel, Matthew Green, Abhishek Jain, and Gabriel Kaptchuk. CRYPTO 2021 [eprint PDF]
  • Meteor: Cryptographically Secure Steganography for Realistic Distributions.*
     Gabriel Kaptchuk, Tushar Jois, Matthew Green, and Aviel D. Rubin. ACM CCS 2021. [PDF] [eprint PDF] [Website & Demo with Code]
  • "I need a better description": An Investigation Into User Expectations For Differential Privacy (Best Paper Runner-up)
     Rachel Cummings, Gabriel Kaptchuk, and Elissa Redmiles. ACM CCS 2021. [PDF] [arXiv] [TPDP Poster]
  • Abuse Resistant Law Enforcement Access Systems
     Matthew Green, Gabriel Kaptchuk, and Gijs Van Laer. EUROCRYPT 2021. [eprint PDF]
  • Order-C Secure Multiparty Computation for Highly Repetitive Circuits
     Gabrielle Beck, Aarushi Goel, Abhishek Jain, and Gabriel Kaptchuk. EUROCRYPT 2021 [eprint PDF]
  • Improving Signal's Sealed Sender.*
     Ian Martiny, Gabriel Kaptchuk, Adam Aviv, Daniel Roche, and Eric Wustrow. NDSS 2021. [PDF] [Code]
  • Giving State to the Stateless: Augmenting Trustworthy Computation with Ledgers.*
     Gabriel Kaptchuk, Ian Miers, Matthew Green. NDSS 2019. [eprint PDF][Conference PDF][Code]
  • Fairness in an Unfair World: Fair Multiparty Computation from Public Bulletin Boards.
      Arka Rai Choudhuri, Matthew Green, Abhishek Jain, Gabriel Kaptchuk, Ian Miers. ACM CCS 2017. [eprint PDF] [Conference PDF]
  • Outsourcing Medical Dataset Analysis: A Possible Solution.*
      Gabriel Kaptchuk, Matthew Green, Aviel D. Rubin. Financial Cryptography Conference 2017. [PDF]
  • Dancing on the Lip of the Volcano: Chosen Ciphertext Attacks on Apple iMessage.
      Christina Garman, Matthew Green, Gabriel Kaptchuk, Ian Miers, Michael Rushanan. USENIX Security 2016. [PDF]
  • A Practical Implementation of a Multi-Device Split Application for Protecting Online Poker.
      Gabriel Kaptchuk, Aviel D. Rubin. Annual Security Conference 2016. [PDF]

Publicly Recorded Talks

  • Future of Computer Research 2022: Early Career Researchers Roundtable [Video]
  • Efficient Set Membership using MPC-in-the-Head. (PETs 22) [Video] [PDF Slides]
  • Commit Acts of Steganography—Before it's too late. (RWC 2022) [Video] [PDF Slides]
  • Weaving Social Accountability Into Cryptographic Protocols (Charles River Area Crypto Day 2022) [PPTX Slides]
  • Meteor: Cryptographically Secure Steganography for Realistic Distributions. (ACM CCS 2021) [Video] [PDF Slides]
  • "I need a better description": An Investigation Into User Expectations For Differential Privacy. (ACM CCS 2021) [Video] [PDF Slides]
  • Abuse Resistant Law Enforcement Access Systems. (EUROCRYPT 2021) [Video] [PDF Slides]
  • Order-C Secure Multiparty Computation for Highly Restitive Circuits. (EUROCRYPT 2021) [Video] [PDF Slides]
  • Giving State to the Stateless: Augmenting Trustworthy Computation with Ledgers (NDSS 2019) [Video] [PDF Slides]
  • The Hill We Must Die On: Cryptographers and Congress (RWC 2019) [Video] [PDF Slides]
  • Presentation for Fairness in an Unfair World (CCS 2017) [Video] [PPTX Slides]

Press / Blogs