What are some ways to make cryptography?

Answer 1

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Cryptography means "hidden" "writing" - so any means of having a secret message could be considered crypotgraphy, I guess.

There are pens sold in kids stores that you can write with - that you solve with yet another pen.

Writing with lemon juice

Using an alphabetic code that only your friends and you know -

where A=F, B=G, C=H or something similar.

Giving the alphabet a number code works too.

Here is some more info on cryptography:

http://en.wikipedia.org/wiki/Cryptography

Hope that helps