@misc{cryptoeprint:2017:1209,
    author = {Yiyuan Luo and Xuejia Lai },
    title = {Improvements for Finding Impossible Differentials of Block Cipher Structures},
    howpublished = {Cryptology ePrint Archive, Report 2017/1209},
    year = {2017},
    url = {https://eprint.iacr.org/2017/1209},
}