Valdson S. Cleto,  Routo Terada. 

This paper proposes a modification on the compression function of the MD6 hash function that increases the security of the function regarding the differential attacks. Such modification enables a reduction of up to 28% in the number of rounds needed to demonstrate the strength of the MD6 compression function against differential attacks.

http://www.lbd.dcc.ufmg.br/colecoes/sbseg/2011/004.pdf

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