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aurquiel wrote:In this code

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k = {unknown byte}
for (i = 0; i < len(txt); i++)
  c = txt[i] ^ k
  print c
  k = c

This

Code: Select all

k = c

should be this

Code: Select all

k = txt[i]

It is true! Thank you @aurquiel.
The algorithm is wrong so I have wasted a lot of time by doing this challange...
You should correct this...