Consider the word wireless, composed of eight symbols, each symbol being a letter of the English alphabet.

Consider the word €œwireless,€ composed of eight symbols, each symbol being a letter of the English alphabet. This word is encrypted by first applying a permutation function and then a substitution function. The permutation function is applied on a 4 -symbol half word as follows: (1234) => 4132) €”that is, every half word with input symbols 1234 is transformed to an output half word, which is 4132 . The word is interpreted as a sequence of two half words. The substitution function is as follows:

(a) What is the final output?
(b) What would be the output if the substitution function were applied before the permutation function instead of after it?

Transcribed Image Text:

Input Symbol: eli|1 Substituted Symbol: %24