@misc{cryptoeprint:2001:106,
    author = {Steve Babbage},
    title = {Cryptanalysis of the COS (2,128) Stream Ciphers},
    howpublished = {Cryptology ePrint Archive, Report 2001/106},
    year = {2001},
    url = {http://eprint.iacr.org/2001/106},
}