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I am learning about DES, a Feistel 64-bit block cipher with 16 rounds. Is it possible that an intruder can determine the original input to the S-Boxes?

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    $\begingroup$ Welcome to Cryptography. Are we talking about what kind of intruder? $\endgroup$ – kelalaka Mar 13 at 17:57
  • $\begingroup$ The original input to what S-box? That of the first round? The last? All the rounds? $\endgroup$ – forest Sep 9 at 2:55

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