@misc{cryptoeprint:2015:723,
    author = {Alex Biryukov and Gaëtan Leurent and Léo Perrin},
    title = {Cryptanalysis of Feistel Networks with Secret Round Functions},
    howpublished = {Cryptology ePrint Archive, Report 2015/723},
    year = {2015},
    url = {https://eprint.iacr.org/2015/723},
}