I'm a fifth year PhD candidate at the Johns Hopkins University, under the supervision of my advisors Avi Rubin and Matt Green. This year, I am also a visiting fellow at the Hariri Institute for Computation at Boston University. I completed my undergraduate degree in Computer Science and Electrical Engineering, also from Johns Hopkins. My primary areas of interest are applied cryptography, privacy, and network security, but will probably find anything involving practical cryptography interesting.

I am also an observant Jew and play Ultimate.

Check out the Advanced Research in Cryptography group's website.

A copy of my CV 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 (yes, I know it doesnt have TLS turned on -- I'm working on it).



  • Gabriel Kaptchuk, Ian Miers, Matthew Green. "Giving State to the Stateless: Augmenting Trustworthy Computation with Ledgers." NDSS 2019. [eprint PDF][Conference PDF][Code]
  • Arka Rai Choudhuri, Matthew Green, Abhishek Jain, Gabriel Kaptchuk, Ian Miers. "Fairness in an Unfair World: Fair Multiparty Computation from Public Bulletin Boards." ACM CCS 2017. [eprint PDF] [Conference PDF]
  • Gabriel Kaptchuk, Matthew Green, Aviel D. Rubin. "Outsourcing Medical Dataset Analysis: A Possible Solution." Financial Cryptography Conference 2017. [PDF]
  • Christina Garman, Matthew Green, Gabriel Kaptchuk, Ian Miers, Michael Rushanan. "Dancing on the Lip of the Volcano: Chosen Ciphertext Attacks on Apple iMessage." USENIX Security 2016. [PDF]
  • Gabriel Kaptchuk, Aviel D. Rubin. "A Practical Implementation of a Multi-Device Split Application for Protecting Online Poker." Annual Security Conference 2016. [PDF]


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