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I am confused with round keys and round constant in AES. Are they the same? Can someone explain it to me?

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  • $\begingroup$ Are you asking if the round keys are the same as the round constants, or if each round uses the same round key and round constant? $\endgroup$ – forest Apr 23 at 8:44
  • $\begingroup$ @forest I am asking if the round keys are the same as the round constants. $\endgroup$ – jan Apr 23 at 8:45
  • $\begingroup$ @jan The purpose of round constants is that they are constant bit streams that add just a little bit of noise to the key schedules. $\endgroup$ – b degnan Apr 23 at 13:08
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Round keys are not the same as round constants. A round constant is always the same no matter what the key is. The round keys, however, are an expanded representation of the AES key being used.

For more information, read up on the AES key schedule.

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