@misc{cryptoeprint:2007:109,
    author = {Thomas Ristenpart and Phillip Rogaway},
    title = {How to Enrich the Message Space of a Cipher},
    howpublished = {Cryptology ePrint Archive, Report 2007/109},
    year = {2007},
    url = {http://eprint.iacr.org/2007/109},
}