Welcome to CrypTool-Online
CrypTool-Online (CTO) is a website to explore, play around with, and learn about ancient and modern cryptography. The aim is to attract students, lecturers, and interested individuals.
This is the updated version of CTO. Not all apps have been updated yet. You can find the previous CTO app versions here: https://legacy.cryptool.org