This version of my website is now archived at mid-2020. Current version is available here

Bio

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.

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 (yes, I know it doesnt have TLS turned on -- I'm working on it).

News

I've accepted a position as a Research Scientist at Boston University's Hariri Institute for Computing! I'll be starting there in fall 2020!

ACRAB

Our group 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!

Teaching

If you are looking for BU Classes, please look at my current website.

Johns Hopkins University

Publications

This version of my website is now archived at mid-2020. Current version is available here
  • Fluid MPC: Secure Multiparty Computation with Dynamic Participants.
      Arka Rai Choudhuri, Aarushi Goel, Matthew Green, Abhishek Jain, and Gabriel Kaptchuk. (Preprint Only). [eprint 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 (Preprint Only). [arXiv]
  • 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]

Talks

Press Coverage / Blogs