@misc{cryptoeprint:2011:172,
    author = {T.V. Laptyeva and  S. Flach and K. Kladko},
    title = {The weak password problem: chaos, criticality, and encrypted p-CAPTCHAs},
    howpublished = {Cryptology ePrint Archive, Report 2011/172},
    year = {2011},
    url = {http://eprint.iacr.org/2011/172},
}