Eduardo Takeo Ueda,  Routo Terada. 

We analyze the ?2 attack, one of the most successful cryptanalysis technique against the RC6 algorithm. We apply this type of cryptanalysis as distinction attack as well as key-recovery attack. We present a modified version of RC6 by introducing a swapping function in its structure. The conclusions inferred by stastistical experiments is that this modified version is stronger against the ?2 cryptanalys technique.

http://www.lbd.dcc.ufmg.br/colecoes/sbseg/2007/005.pdf

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