Being very new to C++ and cryptography, I finally managed to implement a version of the Vinegere algorithm. I would like to try something a bit more complicated. I have looked at AES and DES and others like them, but I was wondering if there is something simpler. Something that might use some of the same basic ideas as AES, but is much simpler. Some kind of block cipher maybe?
So I am asking for suggestions for a block cipher that is much simpler than AES, but more complex than a basic substitution algorithm. I have by the way looked into the method used in the Enigma-machines, but from what I understand they do "basically" the same as Vigenere.