It took us a long way to reach the current communication pattern we use in our civilized societies. Scripts have been formulated and encrypted in history. Many of these are known to us (deciphered) and some of the ancient scripts have evolved to become present scripts. Many non-deciphered writing systems date from ancient time exist like a puzzle to us. These include Indian Harappan script along with scripts from different ancient civilizations such as Etruscans, Rongorongo script, Zapotec script etc. It took us a long way to reach the current communication pattern we use in our civilized societies. Scripts have been formulated and encrypted in history. Many of these are known to us (deciphered) and some of the ancient scripts have evolved to become present scripts. Many non-deciphered writing systems date from ancient time exist like a puzzle to us. These include Indian Harappan script along with scripts from different ancient civilizations such as Etruscans, Rongorongo script, Zapotec script etc.

References :

Some Undeciphered Languages | Mentalfloss

The Engima of the World’s Undeciphered Languages

Unsolved Ciphers | Nebula