= 2.10 The following questions concern the message space M = set of all nonempty binary...

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= 2.10 The following questions concern the message space M = set of all nonempty binary strings of length at most l. {0,1}≤, the (a) Consider the encryption scheme in which Gen chooses a uniform key from K {0, 1}, and Enc(m) outputs k\m| © m, where kt denotes the first t bits of k. Show that this scheme is not perfectly secret for message space M. (b) Design a perfectly secret encryption scheme for message space M. = = 2.10 The following questions concern the message space M = set of all nonempty binary strings of length at most l. {0,1}≤, the (a) Consider the encryption scheme in which Gen chooses a uniform key from K {0, 1}, and Enc(m) outputs k\m| © m, where kt denotes the first t bits of k. Show that this scheme is not perfectly secret for message space M. (b) Design a perfectly secret encryption scheme for message space M. =

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a To show that the encryption scheme is not perfectly secret we need to demonstrate that the probabi... View the full answer