What is the significance of using only 5 x 5 matrix?

Q1)

a-What is the significance of using only 5 x 5 matrix?

b-What is the criteria of selecting which letter to add to the plaintext to make it even number of characters?

c-What is the weakness of playfair cipher?

d-Given the Keyword and the cipher text generated using playfair cipher, find the plain text. Show all the steps.

Keyword : CIPHER

Cipher text : RGXHUQOGBIDHNZMFDKFUQDSX

f-Encrypt the above plain text using Double playfair technique with any two keywords of your choice. Show all the steps. Give the keywords along with your answer. [10 Marks]

Q2)

a-Write 5 differences between Substitution cipher and Transposition Cipher.

b-Encrypt the given plaintext using columnar transposition cipher and 4 columns. Show all the steps.

“TRY NOT TO GET HACKED”

c-Write the mathematical function of Affine Cipher. Encrypt the text “ZERO DAY ATTACK” with the key (9,7) using Affine cipher. Show all the steps.

Requirements:

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