Question: Let E : { 0 , 1 } k times { 0 , 1 } l 7 - > { 0 , 1 }

Let E : {0,1}k \times {0,1}l 7->{0,1}l be a block cipher. Consider the following symmetric
encryption scheme SE =(K, E, D) whose message space is the set of messages whose
length is a multiple of l bits and whose encryption and decryption algorithms are
defined for each K in {0,1}k as follows:

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