Yevgeniy Dodis Thomas Ristenpart Thomas Shrimpton Salvaging Merkle-Damgård for Practical Applications. 371-388 2009 EUROCRYPT http://dx.doi.org/10.1007/978-3-642-01001-9_22 conf/eurocrypt/2009 db/conf/eurocrypt/eurocrypt2009.html#DodisRS09