@misc{cryptoeprint:2014:578,
    author = {Peter Gaži and Krzysztof Pietrzak and Michal Rybár},
    title = {The Exact PRF-Security of NMAC and HMAC},
    howpublished = {Cryptology ePrint Archive, Report 2014/578},
    year = {2014},
    url = {https://eprint.iacr.org/2014/578},
}