What is the difference between a rngs and prngs

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Reference no: EM133500154

Question 1
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?

Question 2

What is the difference between a RNGS and PRNGS?

Question 3
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.

Question 4
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 youranswer.

Reference no: EM133500154

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