The messages below were encrypted using the technique illustrated in Figure 2-11(using displacement keys other than 5). Using trial and error, decode them. Hint: This task becomes easy if you use an Excel spreadsheet and VLoomUp formulas that reference a table of letters and their numeric equivalencies.

Illustration is given below the question. Im not able to add it as it is already attached.

Message 2: QBZAPJL KLSHFLK PZ QBZA-PJL KLUPLK

Message 3: FAA YMZK OAAWE EBAUX FTQ NDAFT

uses a single cryptographic The data encryption method illustrated in Figure 2-11 key that is shared by two communicating parties and is called secret key encryption. Encryption Scheme Letters of the alphabet: AB C D E F G H I Numerical equivalent:1 2 34 5 6 7 Plus displacement key: 5 5 5 5 5 5 5 5 10 6 7 8 9 10 11 12 13 14 15 F Letters to use in code: G H LM Plaintext message: Ciphertext message: HI, ABE MN, FGJ FIGURE 2-11 A simple substitution encryption method