Question

If all letters have the same chance of being chosen, the IC is approximately

(a) 0.065

(b) 0.035

(c) 0.048

(d) 0.038

I have been asked this question in an international level competition.

Question is from Substitution and Transposition Techniques topic in section Classical Encryption Techniques of Cryptograph & Network Security

Answer 1

Right answer is (d) 0.038

Explanation: If all letters have the same chance of being chosen, the IC is approximately 0.038, about half of the IC for the English language.