solve using python

Write a software (GUI) that can be used to encrypt and decrypt text messages. There should be no limit on the size of the message. Your program should first ask the user if she/he wants to encrypt or decrypt a message. Then, it should ask her/him to enter the message. Your program should print the encrypted or decrypted message based on the user input. You should implement a GUI to this program. Part 1: Analysis: (10 pts) Describe the problem (briefly) including input and output in your own words. Part 2: Design: (20 pts) Describe your design: describe the major steps for solving the problem. What functions you have implemented and used to solve the problem. What python functions you used. Make sure to write an encrypt and decrypt functions to make your code readable Use a flow chart to show the design of your system. (bonus 10 pts). Design a GUI interface for your program and describe it Part 3: Source code: (60 pts) Write your code with comments and use descriptive variable names. Don't forget to implement a GUI interface for your program using the tkinter module. Part 4: Testing: (10 pts) Describe what test cases you used to check the validity of your code (you might have more cases). Examples: 1. Entering a message to encrypt 2. Entering a message to decrypt 3. Entering a wrong command (neither encrypt nor decrypt)