@misc{cryptoeprint:2006:253,
    author = {Ilya Mironov and Anton Mityagin and Kobbi Nissim},
    title = {Hard Instances of the Constrained Discrete Logarithm Problem},
    howpublished = {Cryptology ePrint Archive, Report 2006/253},
    year = {2006},
    url = {http://eprint.iacr.org/2006/253},
}