BibTeX: 
@article{Sigma_Commit_CryptoAFP,
author = {David Butler and Andreas Lochbihler},
title = {Sigma Protocols and Commitment Schemes},
journal = {Archive of Formal Proofs},
month = oct,
year = 2019,
note = {\url{https://isaafp.org/entries/Sigma_Commit_Crypto.html},
Formal proof development},
ISSN = {2150914x},
}
