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3. Hill cipher: 6 24 1 16 20 17 15 a. If a Hill cipher has an encryption key K-1 13 10 | , the plain text is "JELLYFISH", what is the ciphertext in English characters? Note: Suppose each letter is represented by the value of its position, i.e., letter A is o, letter B is 1, letter T is 19, letter Z is 25. Please show your steps. You may use online matrix calculator(e.g. https://matrixcalc.org/en/) to calculate matrix.15 points) what is the Hill cipher key matrix K that can realize the following permutation? b, (10 points) : 3 1 | , Hint: consider a key matrix with only 0's and 1's