I'm interested in learning how to use AES-256 encryption in C/C++. I'm still a beginner in Cryptography but I'm confident in my abilities to program.
There is still a lot for me to learn about this topic so please don't respond telling me that I shouldn't be implementing the algorithm or that I should be in college. I'm not, and never will be.
My question is just on the method of transposition used after you send the function a message and a key. I don't fully understand how to use the key but I understand enough to know that the message chars go though a function that gets called a minimum of 10 times. I also understand that the function goes through a processes of Substitution -> Transposition -> Substitution -> XOR
My question regards Transposition. I understand two methods(I don't know their name) One where you draw your message bit by bit on a line alternating top and bottom, eventually combining the top half with the bottom half. The other method I understand is where you have say a number and use the number to encrypt ex:
3612 hell othe rexy
cipher text: lhxleyhorete
Which methods are used in AES-256? Does it use more than one?