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Scott, MIT Graduate

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Problem 5. Consider a plaintext that could contain only

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Problem 5. Consider a plaintext that could contain only upper and lowercase English characters along with the digits 0-9 and spaces and periods. What is the maximum value of its entropy? and why? 5 Answer: What is the minimum entropy for such a plaintext? What would such a plaintext look like? 5 Answer: You intercept a long ciphertext containing 4 unique symbols A,B,C, and D. A comprises half of the characters in the ciphertext, B comprises 1=16 of the characters, C makes up 1=16 of them, and D makes up the rest. What is it's entropy? 5 Answer: Given 2 ciphertexts (C1 and C2) encrypted with the one-time pad using the same key. What can you learn about the 2 plaintexts?

The first question is a little vague. What formula are you using for text entropy? The one I use is a summation, and the total is only limited by the length. Does yours divide to get a normalized entropy?