@misc{cryptoeprint:2006:289,
    author = {Hovav Shacham and Brent Waters},
    title = {Efficient Ring Signatures without Random Oracles},
    howpublished = {Cryptology ePrint Archive, Report 2006/289},
    year = {2006},
    url = {http://eprint.iacr.org/2006/289},
}