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In feistel cipher , does it matter that number of rounds ? is using more rounds will give the best result? or it's all about the key size ?

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    $\begingroup$ Does this answer your question? Increase number of rounds for SPN and Feistel ciphers. Simply it increases the attack times, except the upper bound = brute force. $\endgroup$ – kelalaka Apr 4 at 18:25
  • $\begingroup$ yes increasing the rounds doesn't mean increasing security but why ? $\endgroup$ – Nadjib Rahmani Apr 4 at 18:37
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    $\begingroup$ Read the answer, and note that the provided security by any cipher cannot exceed the key search by brute-force. $\endgroup$ – kelalaka Apr 4 at 18:44