Source code for the signature revocation component of the Hash-based EPID scheme described in:
A New Hash-based Enhanced Privacy ID Signature Scheme
Liqun Chen, Changyu Dong, Nada El Kassem, Christopher J.P. Newton and Yalan Wang
To be published in the Proceedings of PQCrypto 2024.
This project is a test implementation of the hash-based EPID signature revocation scheme. The code uses some of the reference picnic3 code from:
https://github.com/Microsoft/Picnic.
There are separate executables for each value of the number of bits in the LowMC state (n). The executables are built using cmake, which is set to allow executables for n=129 or n=255 to be built.
The executable are:
- generate_epid_srl_nnn. this generates a signature revocation list that can then be used for testing.
nnn is the number of bits in the LowMC state being used.
- hbgs_sigrl_list_test_nnn, this generates the proof that the signer's key is not inlcuded in the SRL ($\pi_R$)
and then runs the verification check. The output is a set of timings for the different stages together with the
signature size.
For installation and testing see README.TXT.
The main body of code is licensed under the BSD two clause licence (see LICENCE.TXT).
The Picnic code that is used in this implementation has its own licence (see HBGS_picnic/LICENCE).