@misc{cryptoeprint:2009:250,
    author = {Mehreen Afzal and Ashraf Masood},
    title = {Modifications in the Design of Trivium to Increase its Security Level},
    howpublished = {Cryptology ePrint Archive, Report 2009/250},
    year = {2009},
    url = {http://eprint.iacr.org/2009/250},
}