Question: Let F be a pseudorandom function, and consider the following construction of a stream cipher accepting an n - bit initialization vector: Init ( s

Let F be a pseudorandom function, and consider the following construction of a stream cipher accepting an n-bit initialization vector:
Init(s, IV) outputs st =(s, IV).
Next(s, IV) outputs y := Fs(IV) and st'=(s, IV +1).
Show that this stream is not secure.

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