Use matlab or octave to code. DO NOT USE if statements, while or for loops, reshape commands. Only use vectors, matrices, strings, and functions.

5. (Substitution Cipher) A substitution cipher is a more complicated way to encrypt text than a Caesar cipher. The basic version of a substitution cipher converts each given character in a message by permuting the letters of the alphabet based on a fixed permutation. The permutation itself can be simply viewed as a permutation of the numbers 1 through 26. Any permutation of these numbers can easily be represented by vector of length 26 consisting of the integers from 1 to 26, each appearing exactly once. For instance, the vector [2, 3, 4, 5, 26, 1] represents the permutation that converts 1 to 2, 2 to 3, ..., 25 to 26, and 26 to 1. For this problem, you should write two separate functions: the first handles the con- version of just a single character while the second works on a string of length 3. subs_char Function: . Input Variables: a single character to be converted using the substitution cypher a permutation (as described above) to be used in the encryption Output variables: a single character of encrypted text subs_cipher Function: Input Variables: a length 3 string of lower case letters representing a short plain text message a permutation (as described above) to be used in the encryption Output variables: a length 3 string representing the results of the encryption Hint: For the subs_char function, you'll need to convert the character to a number between 1 and 26 and use this as an index in the permutation vector. A possible sample case is: represents the permutation that converts 1 to 2, 2 to 3,..., 25 to 26, and 26 to 1. For this problem, you should write two separate functions: the first handles the con- version of just a single character while the second works on a string of length 3. . subs_char Function: Input Variables: a single character to be converted using the substitution cypher a permutation (as described above) to be used in the encryption Output variables: a single character of encrypted text subs_cipher Function: Input Variables: a length 3 string of lower case letters representing a short plain text message a permutation (as described above) to be used in the encryption Output variables: a length 3 string representing the results of the encryption Hint: For the subs_char function, you'll need to convert the character to a number between 1 and 26 and use this as an index in the permutation vector. A possible sample case is: >> cchar = subs_char('a', [2:26, 1]) cchar = b >> ctext subs_cipherlabc', [ 5, 7, 1, 2:4, 6, 8:26 ]) ctext = ega >> ctext = subs_cipher ('abc', randperm(26)) ctext = gts