Question: Take the message space M = { 0 , 1 } L , the set of all nonempty binary strings of length at most L

Take the message space M ={0,1}L , the set of all nonempty binary strings of length at most L. Consider the encryption scheme in which Gen chooses a uniform key from K ={0,1} L ; for any k in K, let us denote by kt the binary string containing the first t bits of k. Then, Enck(m) outputs m k|m| and Deck(c) outputs c k|c|. Explain why this scheme is not perfectly secret for message space M.

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