@misc{cryptoeprint:2007:135,
    author = {Jingwei Liu and Rong Sun and Weidong Kou and Xinmei Wang },
    title = {Efficient ID-based Signature Without Trusted PKG},
    howpublished = {Cryptology ePrint Archive, Report 2007/135},
    year = {2007},
    url = {http://eprint.iacr.org/2007/135},
}