@misc{cryptoeprint:2004:329,
    author = {Ran Canetti and Shai Halevi and Michael Steiner},
    title = {Hardness amplification of weakly verifiable puzzles},
    howpublished = {Cryptology ePrint Archive, Report 2004/329},
    year = {2004},
    url = {http://eprint.iacr.org/2004/329},
}