@misc{cryptoeprint:2012:001,
    author = {Andrew C. Yao and Yunlei Zhao},
    title = {Digital Signatures from Challenge-Divided Sigma-Protocols},
    howpublished = {Cryptology ePrint Archive, Report 2012/001},
    year = {2012},
    url = {http://eprint.iacr.org/2012/001},
}