AES flow visualization
In 2001 we constructed the flow visualization for Rijndael, now known as AES. It's a Java applet, so you may have to take the risk of running it. And it's old.
A newer implementation of the same was implemented in cryptool 1. It can be found in the German version via the menu Einzelverfahren, Visualisierung von Algorithmen, AES, Rijndael Flussvisualisierung... But beware:
Warning: In September 2015 under (my) Windows 7 clicking that entry opens a Window "Open with" and asks to choose the program you want to use to open java.exe. If that happens: CANCEL! Instead go to the folder where you installed CrypTool and start the file AES_Flussvisualisierung.jar.