How people communicated with codes in the olden times?

Answer 1

In ancient times, people used various forms of codes to communicate secretly, often to protect sensitive information or during times of conflict. Simple methods included substitutions, where letters were replaced with symbols or other letters, such as in the Caesar cipher. Additionally, they employed physical symbols, such as flags or smoke signals, and even created elaborate systems like the use of hieroglyphics in Egypt. These coded messages allowed for discreet communication over distances and among groups without revealing the content to outsiders.