Requirements:

Please write a Java code that will help me decipher this $.$txt file I have. You need to submit:

$(20$ points$)$The program for obtaining the frequency of each letter and two letter combinations in the

ciphertext.

$(15$ points$)$ The program to decrypt the document using a key.

You can choose the programming language you like, but you should implement the file processing $($e$.$g$.$ read in

the file in$,$ find the counts and frequency of each letter, replace the ciphertext letter with the plaintext letter in

the file, and then write the tentative plaintext into a file$)$ by yourself instead of just calling one method for

counting the frequency or replacing letters in a file.

$(20$ points$)$ Your analysis on the key that was used. This can be a word or text document. You should primarily

use the frequency analysis $($Single letter frequency and two letter frequency is likely enough$)$ and assist it with

analysis on chosen ciphertext using your knowledge with the English language $($refer to the example in Module $1$

Slide $52).$

$(5$ points$)$ The decrypted text $($plaintext$)$ corresponding to your ciphertext.