MakeCode Arcade - Vigenere Cipher Activity

This program uses a Vigenère cipher to encode an image and decode the image.
At the top of the screen is the color pattern which is used as the encryption key.
Press button A to 'encrypt' the image.
How good is this encryption? Can you still recognize the image once it's encrypted? Or not?
Press button B to 'decrypt' the image.
Read the code and see if you can understand what it's doing.
Use the debugger/"slo-mo" to see how the program is stepping through lines of code.
Change the Sprite image (pick a different image from the Gallery or draw your own).
Change the Password color pattern - pick fewer colors.
See if your neighbor can correctly identify the image.
Now change the Password color pattern again - this time pick more colors.
Now see if your neighbor can identify the image.
What does this tell you about the importance of a strong password?