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.


My group at JHU recently set up a website to help keep track of all the exciting new publications in applied crypto researching. While EPrint is great and all, its hard to read 1500 publications a year, especially when very few of them are applied. We call it Applied Cryptography Research: A Board aka ACRAB. Check it out! Make an account and help out!



(authors alphabetical by default)
  • 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. [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. [eprint PDF]
  • "I need a better description": An Investigation Into User Expectations For Differential Privacy
     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 Rosche, and Eric Wustrow. NDSS 2021. [PDF]
  • 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]


  • Stacking Sigmas: A Framework to Compose Σ-Protocols for Disjunctions.
      Aarushi Goel, Matthew Green, Mathias Hall-Andersen, and Gabriel Kaptchuk. [eprint PDF]

Recorded Talks

  • Abuse Resistant Law Enforcement Access Systems. (EUROCRYPT 2021) [Video]
  • Order-C Secure Multiparty Computation for Highly Restitive Circuits. (EUROCRYPT 2021) [Video]
  • 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