@misc{cryptoeprint:2008:201,
    author = {J. Wu and D.R. Stinson},
    title = {How To Ensure Forward and Backward Untraceability of RFID Identification Schemes By Using A Robust PRBG},
    howpublished = {Cryptology ePrint Archive, Report 2008/201},
    year = {2008},
    url = {http://eprint.iacr.org/2008/201},
}