@misc{cryptoeprint:2013:138,
    author = {Zhang Wei, Liu Shuguang, Yang Xiaoyuan},
    title = {Multi-bit homomorphic encryption based on  learning with errors over rings},
    howpublished = {Cryptology ePrint Archive, Report 2013/138},
    year = {2013},
    url = {http://eprint.iacr.org/2013/138},
}