Sejin SNR8012 80-Key Unencoded Matrix Keyboard

in this video I'm showing how to use matrices to encode and decode messages and I'm making the assumption when I make this video that you know how to multiply matrices already and that you've had some experience using a graphing calculator to do that so that's how I will be multiplying the matrices if you need some help with that I have a video on using the graphing calculator for multiplying matrices as well so to start out with sometimes messages need to be given but you don't want someone else to know for instance if I was working with a friend and we were selling stocks I might want to let them know hey sell some stock right now but I don't want everybody else to know that I just told them that so I'm going to have this message right here sell now that I want to give to that person well one option is to try to code that in some way that they could they could see the see some charact