Question: Show that a 2-round keyed Feistel cipher cannot be a secure PRP, no matter what its round functions are. Your attack should work without knowing

Show that a 2-round keyed Feistel cipher cannot be a secure PRP, no matter what its round functions are. Your attack should work without knowing the round keys, and it should work even with dierent (independent) round keys. Hint: A successful attack requires two queries.

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