The textbook gives a similar example of proving the below problem:enter image description hereenter image description here

Based on this, how would I go about showing $y={DES(k, x)} => \overline y=DES(\overline k, \overline x)$, within the same format as the answer for the above example? Thanks

  • 2
    $\begingroup$ Does this answer your question? Complement property of DES, Proving DES complementation property: y = DES(k,x) ⟹ /y = DES(/k, /x) $\endgroup$
    – Mikero
    Commented Apr 17 at 22:39
  • $\begingroup$ No it does not, unfortunately. I wrote that question and the answer was not close to what is expected as in the above example solution $\endgroup$
    – sangaCat
    Commented Apr 18 at 0:30
  • 1
    $\begingroup$ Rather than post a new question asking the same thing, please edit and clarify your previous post. Also, I strongly suspect that this is homework (if you just wanted to understand the DES complementation property, why is it important to match the style/format of a textbook?), and none of us here have any incentive to put more work into your homework than you put into it. $\endgroup$
    – Mikero
    Commented Apr 18 at 1:39
  • $\begingroup$ @Mikero Thing is if I do not ask it to be in similar format, people would throw unsensible suggestions that are nowhere near the expectations. $\endgroup$
    – sangaCat
    Commented Apr 18 at 4:28


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