Considering the English alphabet, use Playfair cipher to encrypt the following plaintext= STORY You have to create the secret key matrix as follows: - First write the letters of the word BED in the first row of the five by five matrix starting from the upper left corner. - Then finish filling the remaining cells of the matrix row by row with the remaining letters of the alphabet, in alphabetical order.

Notes: 1. Put the letters I and J in one cell 2. Follow the encryption steps in the textbook (Forouzan).

Show all the steps to the final ciphertext.