Computing entropy of plaintext message

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Q1) A foreign navy has implemented a secure communications system in which submarine commanders transmit a single 5-letter message every day. The messages may only use capital (English) letters, and all messages are equally probable. A crypto device encrypts each message into 20 bits of ciphertext.

a. Compute the entropy of the plaintext message?

b. Compute the entropy of the ciphertext message?

c. Is this a good cryptosystem? Why or why not?

Reference no: EM1345829

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