Question

1) Make a substitution table corresponding for the Monoalphabetic Substitution corresponding to the key (G, Twelfth Night). Enter the bottom row of your substitution (called the cipher alphabet) below. Your input should be 26 capital letters with no spaces.

2) Encrypt the following message with Monoalphabetic Substitution using key (Q, As You Like It). Enter your ciphertext in 4-grams in capital letters. Message: If music be the food of love play on.

3) Decrypt the following ciphertext created with Monoalphabetic Substitution using key (U, Measure for Measure). Enter your plaintext in 4-grams in lower case letters. Message: BTXL FYUY IBTH DIBX CBBI IKMZ TKXB TQJN C

please answer all of the questions.

Answer 1

Given problem is based on Monoalphabetic Substitutional cipher with key letter and keywords as key.

The detailed solutionis present in the images attached below: