Jean-Philippe Aumasson Orr Dunkelman Sebastiaan Indesteege Bart Preneel Cryptanalysis of Dynamic SHA(2). 415-432 2009 Selected Areas in Cryptography http://dx.doi.org/10.1007/978-3-642-05445-7_26 conf/sacrypt/2009 db/conf/sacrypt/sacrypt2009.html#AumassonDIP09