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I'm learning DES, but I have a question.

When the plain text input, it gets a permutation by a table. Table

But, I don't know why 01 -> 58 / 02 -> 50. Is there any special rule or principle of it? or was it just set by the creator of DES?

fgrieu
  • 149,326
  • 13
  • 324
  • 622
AABAA
  • 1

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