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Homomorphic Time-Lock Puzzle Schemes

This is the repository for the paper

Towards Practical Homomorphic Time-Lock Puzzles: Applicability and Verifiability, ESORICS 2022 [Link]

by Yi Liu, Qi Wang, Siu-Ming Yiu.

Introduction

This repository provides implementations for the additively homomorphic time-lock puzzle scheme with solution space $\mathbb{Z}_n$ in [MT19] and our multiplicatively homomorphic time-lock puzzle scheme with solution space $\mathbb{Z}_n^*$.

To avoid the redundant cost of the puzzle-solving process, we provide three simple and fast protocols for both the additively HTLP scheme with the solution space $\mathbb{Z}_n$ and our multiplicatively HTLP scheme, respectively, to verify the following three properties.

  1. Correctness. A puzzle solver is able to convince other parties of the correctness of the solution that he solves from a puzzle.
  2. Invalidity. Upon finding that a puzzle is invalid, one can convince other parties of the invalidity of the puzzle.
  3. Validity. A puzzle generator can convince other parties of the validity of the puzzle he generated.

Dependencies

This project has dependencies of NTL and OpenSSL.

Build

  1. Install NTL.

  2. Install libssl-dev

  3. Clone the repository:

    git clone https://github.com/liu-yi/HTLP
    
  4. Enter the directory

    cd HTLP
    
  5. Assuming you have globally installed NTL and libssl-dev:

    make
    
  6. You can test the execution by ./TestHTLP, which is defined in src/main.cpp.

htlp's People

Contributors

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