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Why is a two-round Feistel Network not a PRF?

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I am a student studying PRP and PRF in school, my prof gave us a thinking question: "Why is a two-round Feistel network not a PRF, even while the component function is a PRF?"

I've seen that why this is a less-secure encryption but not sure how less-secure related to the question that prof gave us.

Daniel S avatar
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Hint: Consider two inputs with the right halves equal.
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