Question: Let E(k,x) be a secure block cipher. Consider the following tweakable block cipher: E' ((k1, k 2 ),t , x )=E(k1, x) XOR E(k 2,t),where

Let E(k,x) be a secure block cipher. Consider the following tweakable block cipher: E' ((k1, k 2 ),t , x )=E(k1, x) XOR E(k 2,t),where XOR denotes the exclusive or operator Is this tweakable block cipher secure? Justify your answer briefly

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