Have you ever wanted to send a secret message that only your best friend could read? What if you lived in a time when sharing the wrong information could get you into serious trouble—or even start a war? That’s where secret codes and ciphers come in. These clever systems have been used for thousands of years to hide messages and protect important information from falling into the wrong hands.

In this topic, we’re going to explore the mysterious world of secret codes and ciphers. You’ll learn how ancient rulers, wartime spies, and even modern-day hackers have used special symbols and tricky maths to keep secrets safe. Some codes changed history, others were never cracked, and a few still puzzle experts today.