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Re-using their design might be no good idea - there are cheaper designs for sure. This new DES cracker would just need to try every possible key - like the one of the EFF already did. DES was a big standard for encryption, so some people did build such machines, right? Of course did they: COPACOBANA is able to break DES in under 9 days and costs under ...


2

In short, yes. The complementation property of DES states that if $DES_K(P) = C$, then $DES_{\overline{K}}(\overline{P}) = \overline{C}$, where $\overline{X}$ is the complement of a string $X$. ECB with DES takes a message $M_1M_2\cdots M_\ell$ and computes $C_1C_2\cdots C_\ell$, where $C_i = DES_K(M_i)$, for $1\le i\le\ell$. Therefore, if you encrypt ...



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