ITS64304: You are informed that this message has been encrypted as a mono-alphabetic cipher: Theory of Computation Assignment, TU, Malaysia

School

Taylor's University (TU)

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Assignment Type

Individual Assignment

Subject

ITS64304: Theory of Computation

Uploaded by Malaysia Assignment Help

Date

19/11/2021

You are informed that this message has been encrypted as a mono-alphabetic cipher. Assume that no letter is encoded as itself and that no two letters are encoded to the same letter.

  • How many possible mono-alphabetic ciphers are there for the English language?
  • What is the complexity of the above mono-alphabetic cipher in terms of Big-O
    notation?
  • If you observe there are only 14 different letters in the given encrypted message. Calculate, how many possible decryptions are there for this message?
  • Assuming that you can test about 1 million possible ciphers per second, calculate how long in terms of the number of years it would take to test all possible descriptions of this message?

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