Substitution ciphers

Part of the course: Introduction to cryptography 1 (created in connection with training days DDC 2023). Link to materials: https://drive.google.com/drive/folders/1ltWMQ0y4LgfH268YdQAsA8Eb-mcep6H4?usp=share_link Note: You can ask questions in the comments here on Youtube. I will do my best to check and answer, but I hope you can also help each other out with answers, if you know them. Note also: If you have cool resources connected to what I am saying. Please also share them in the comments, so others can benefit!