@misc{cryptoeprint:2007:100,
    author = {Shengbao Wang and Zhenfu Cao},
    title = {Practical Identity-Based Encryption (IBE) in Multiple PKG Environments and Its Applications},
    howpublished = {Cryptology ePrint Archive, Report 2007/100},
    year = {2007},
    url = {http://eprint.iacr.org/2007/100},
}