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Privacy-Preserving Event Scheduling

Privacy-preserving event scheduling system

By Ágnes Kiss, Oliver Schick and Thomas Schneider (ENCRYPTO, TU Darmstadt) in SECRYPT'19. Paper available here, poster available here.


Our implementation for privacy-preserving event scheduling is based on secure computation, more specifically, on the ABY framework (

This code is provided as a experimental implementation for testing purposes and should not be used in a productive environment. We cannot guarantee security and correctness.


The requirements are the same as that of and you need to install Node.js for the web application by running

sudo apt-get install nodejs
sudo apt-get install npm

Building the Scheduling System

Clone a version of ABY and place the sec_doodle folder in the ABY/src/examples folder. Add line


in ABY/src/examples/CMakeLists.txt and build the framework according to the instructions here building the executables also for the example applications. Then, you should have a sec_doodle.exe file in the ABY/build/bin folder.

Running the Scheduling System

Start three terminals and do the following:

  • In the first terminal, cd into the HTML folder, and run
npm install
node main.js
  • In the second terminal, cd into the ABY/build/bin folder, and run
./sec_doodle -r 0
  • In the third terminal, cd into the ABY/build/bin folder, and run
./sec_doodle -r 1
  • Open a browser and connect with https://localhost:8443.
  • Set up the poll following the instructions and submit admin vote (use dummy email addresses, as no email forwarding is in place).
  • For each other participant, open in HTML/polls the file pollxx.json, where xx is the poll number shown in the link. Copy the passwords from the file (stored in the array "passwords") and replace in the link the admins password with that of the participant to be able to vote.


Privacy-preserving scheduling system







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