Streaming Function Secret Sharing Implementation

This repository contains our implementation of streaming function secret sharing (SFSS), a new variant of function secret sharing (FSS) that is particularly suitable for secure computation over streaming messages. SFSS facilitates several promising applications in a simple and modular fashion, including conditional transciphering, policy-hiding aggregation, and attribute-hiding aggregation. In this repository, we provide our implementation of SFSS primitives, including streaming distributed point functions and streaming distributed comparison functions, with applications including window-based policy/attribute-hiding aggregation.

The paper can be found at https://ia.cr/2025/2304. Please refer to the Open Science section in the paper for more details.

Requirements

emp-toolkit (https://github.com/emp-toolkit/emp-tool)

Cmake (version >= 3.12) (https://cmake.org)

GMP (we use version 6.3.0) (https://gmplib.org)

Build

1. Make the build directory and cd into the directory

   mkdir build
   cd build
   

2. Build using cmake

   cmake ..
   

3. Generate the target

   make 
   

Run

1. Run basic FSS and SFSS primitive

   ./bin/sfss_main 
   

2. Run related applications with network.

   • Open terminal 1, run ./bin/client_runner_main
   • Open terminal 2, run ./bin/server_runner_main 0 12345
   • Open terminal 3, run ./bin/server_runner_main 1 12346

   The result will be shown in the terminals.

Citing

@misc{cryptoeprint:2025/2304,
      author = {Xiangfu Song and Jianli Bai and Ye Dong and Yijian Liu and Yu Zhang and Xianhui Lu and Tianwei Zhang},
      title = {Streaming Function Secret Sharing and Its Applications},
      howpublished = {Cryptology {ePrint} Archive, Paper 2025/2304},
      year = {2025},
      url = {https://eprint.iacr.org/2025/2304}
}