@misc {IOPORT.70675488,
    author       = {Biryukov, Alex and Lamberger, Mario and Mendel, Florian and Nikolic, Ivica},
    title        = {Second-order differential collisions for reduced SHA-256},
    howpublished = {ASIACRYPT, 270-287 (2011).},
    year         = {2011},
    doi          = {10.1007/978-3-642-25385-0_15},
    identifier   = {70675488},
}