@misc{cryptoeprint:2004:156,
    author = {Kenneth G. Paterson and Fred Piper and Ruediger Schack},
    title = {Why Quantum Cryptography?},
    howpublished = {Cryptology ePrint Archive, Report 2004/156},
    year = {2004},
    url = {http://eprint.iacr.org/2004/156},
}