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Crypto device encryption

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Reference no: EM1321698

A foreign navy has implemented the secure communications system where submarine commanders transmit the single 5- letter message every day. The messages may only utilize the capital (English) letters, and all the messages are equally probable. A crypto device encrypts each message into the 20 bits of the ciphertext.

a) Specify the entropy of the plaintext message?

b) State the entropy of the ciphertext message?

c) Whether this is the good cryptosystem? Why or why not?

Reference no: EM1321698

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