How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Scott Your Own Question
Scott
Scott, MIT Graduate
Category: Homework
Satisfied Customers: 3040
Experience:  MIT Graduate (Math, Programming, Science, and Music)
3546829
Type Your Homework Question Here...
Scott is online now
A new question is answered every 9 seconds

Problem 5. Consider a plaintext that could contain only

Customer Question

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?
Submitted: 1 year ago.
Category: Homework
Expert:  Ray Atkinson replied 1 year ago.

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?

Related Homework Questions