I'm not a mathematician, and i would like to understand in the most concise way (if possible) why choosing linear S-Box functions makes the DES algorithm attackable. Thanks
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$\begingroup$ Make them identity of the first 4 input? $\endgroup$– kelalakaCommented Oct 16, 2019 at 13:51
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$\begingroup$ Can you write an example ? $\endgroup$– AleWolfCommented Oct 16, 2019 at 14:15
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1$\begingroup$ \begin{align} S:\{0,1\}^6&\to \{0,1\}^4\\ S(a,b,c,d,e,f) &\mapsto (a,b,c,d) \end{align} $\endgroup$– kelalakaCommented Oct 16, 2019 at 15:08
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$\begingroup$ see this answer, for example crypto.stackexchange.com/questions/51017/… $\endgroup$– kodluCommented Oct 16, 2019 at 21:32
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$\begingroup$ and this one crypto.stackexchange.com/questions/63693/… $\endgroup$– kodluCommented Oct 16, 2019 at 21:33
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