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4- Consider a block cipher whose block length is 𝑛. 𝑁 = 2^n is number of possibilities. Imagine wehave 𝑡 plain text-cipher text pairs 𝑃i, 𝐶i = 𝐸k(𝑃i) , where the key 𝐾 selects one of the 𝑁! Possiblemappings. Now, imagine you want to brute force this encryption algorithm for the key. In each try,you generate the test key 𝐾′ and check whether 𝐶i = 𝐸(𝐾'ᇱ, 𝑃i); i=1,…,t. If 𝐾'ᇱ maps 𝑃i to its proper𝐶i, we have an evidence that 𝐾'ᇱ = 𝐾. However, it could be the case that 𝐸k(. ) a

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