@misc{cryptoeprint:2003:049,
    author = {Igor  Shparlinski and Arne Winterhof},
    title = {Hidden Number Problem in Small  Subgroups},
    howpublished = {Cryptology ePrint Archive, Report 2003/049},
    year = {2003},
    url = {http://eprint.iacr.org/2003/049},
}