I liked the use of the simple number equation to explain the process of AES; it made a very complicated idea seem much easier to comprehend. I think that your example is great because it shows how, on the other end, the same key is required to figure out the original data, which is the main point of symmetric ciphers. I also like how you pointed out that without knowing the key, that encrypted number could mean many things; that really helps someone new to cybersecurity understand why encryption is secure.