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What is entropy?
Calculate the entropy of a fair die toss.
Calculate the entropy of a biased die, where the probability of landing “6” is 1/2, the probabilities of the others are equal.
Compare the entropies of the fair die and the biased die? What does higher entropy mean?
You can use the Log Base 2 Calculator hosted here:
https://miniwebtool.com/log-base-2-calculator/
Use the exponents calculator in this address to verify the number of possible landings of a fair dice, which should be 6.
https://www.rapidtables.com/calc/math/Exponent_Calculator.html
What is the difference between a RNGS and PRNGS?
Which one is used for assessing the security of a cryptographic algorithm: Informational security or computational security? Why?
Which is of the following statements are correct? Choose more than one.
a. One-time pad is informationally secure.
b. AES algorithm is computationally secure.
c. Organizations should prefer using informationally secure algorithms over computationally secure algorithms as much as they can.
d. A new cipher that is using 5096-bit key and takes 10^10000 years to break in even by the help of parallel computing infrastructure composed of all microprocesses in the world is informationally secure.
Think about two encryption keys with lengths 80-bit and 128-bit, respectively. Assume that the ciphers using these keys are NIST-approved ciphers. What can be said about these keys?
Do both keys provide similar level of security in practical real-world applications? Please justify your answer.
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