Marc Fischlin Anja Lehmann Krzysztof Pietrzak Robust Multi-property Combiners for Hash Functions Revisited. 655-666 2008 ICALP (2) http://dx.doi.org/10.1007/978-3-540-70583-3_53 conf/icalp/2008-2 db/conf/icalp/icalp2008-2.html#FischlinLP08