@misc{cryptoeprint:2006:063,
    author = {Boris Ryabko and Daniil Ryabko},
    title = {Provably Secure Universal Steganographic Systems},
    howpublished = {Cryptology ePrint Archive, Report 2006/063},
    year = {2006},
    url = {http://eprint.iacr.org/2006/063},
}