cipher
cypher
cryptograph
secret code

Find someone who made a secret code with friends as a child.

They would say there was a secret code between the two of them.

You do have to learn secret codes in both jobs.

It's some secret code he and his friend created when they were kids.

In any case, learning to write a secret code like that is really interesting.

The language the two men speak sounds like a secret code.

The children wrote each other short messages in a secret code they had made.

You'd need to do something like ask in Navajo or some secret code.

All languages are secret codes for people who cannot understand them.

There shouldn't be any secret codes needed by one of the Powers.