Question: User Consider ChaCha 2 0 - new - and - improved, a variant of ChaCha 2 0 where the instruction Output S S ' is

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Consider ChaCha20-new-and-improved, a variant of ChaCha20 where the instruction Output S S' is replaced with the instruction Output S. Show that ChaCha20-new-and-improved is totally insecure under a known-plaintext attack.

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