A Java GUI application for decrypting/encrypting text with the Caesar cipher

Windows: Run the application just by double-clicking the Caesar.exe file. If you don't have Java installed on your computer the application should automatically download and install Java on your system. If that fails then you will have the option to manually install Java after the software takes you to the Java download page.

Linux and Mac: You need to have Java installed on your system. If you do not have Java installed then you can download and install it from here: https://java.com/en/download/

• Linux: Open your terminal, navigate to the folder where the Caesar.jar file is, and type: java -jar Caesar.jar

• Mac: To execute the .jar file on the Mac, go to your terminal and type in: java -cp Caesar.jar menu.Menu

When you run the program, this is the GUI visual interface that will appear on the screen.

(Actually, this is how it looks like under my version of GNU Linux!)

The Java code is written up so that the application will have the "LookAndFeel" of the operating system under which it is running; Therefore, it will look different under Windows, Mac, and other operating systems.

• Under the File drop down menu you can select three options:

  • Open -- opens a file and displays its text in the input text area.

  • Save -- saves the text from the output text area into a file.

  • Exit -- exits the application and quits the program.

• Under the Settings drop down menu you can select one of the two (radio button) options:

  • English dictionary -- the default selected which uses a 10k English words dictionary to crack the encrypted code.

  • Brute force attack -- is the other option that you can select to get the 25 key variations of the encrypted text.

• Under the Help drop down menu currently there is only one option:

  • About -- displays information about the software version, release date, contact information, and displays the GNU GPL 3.0 LICENSE which is read from a file.

  • In future versions we might add a Short User's Manual as another option under the Help drop down menu...

1. Type in a plain text message in the input text area or just open a text file from the File > Open menu option.

2. Select the Brute force attack radio-button option from the Settings drop down menu.

3. Click the Crack it button.

• The display text area will display all 25 key encrypted variations of your text.

• Copy and Paste the variation you like to your message and send it to your recipient...

• Or use the Save option under the File drop down menu to save all of the encrypted variations to a file for later use...

Enjoy!