@misc{cryptoeprint:2016:578,
    author = {Viet Tung Hoang and Stefano Tessaro},
    title = {Key-alternating Ciphers and Key-length Extension: Exact Bounds and Multi-user Security},
    howpublished = {Cryptology ePrint Archive, Report 2016/578},
    year = {2016},
    url = {https://eprint.iacr.org/2016/578},
}