There are 3,790 Unicode emojis. That’s already more than enough for an ideographic writing system; literacy in Chinese requires only 2,000 symbols and hieroglyphics got by with 800. You could make a code out of emojis with enough left over to be letters and numbers. For greater security, you could mix in plaintext red herrings. NSA code breaker Perry Fellwock said you need to intercept about 100,000 words from an unknown language or cipher to break it. A secure communication system based on smartphones and emojis requires no special equipment and would require intense cryptanalysis to break even if every single message was intercepted and analyzed. Of course, that would require recognizing that the messages were in code in the first place. Steganography for the win.
During the Cold War, a certain country invented a clever, low-tech code that was never broken. They taught the code to people with good memories which eliminated the need to write anything down. Sometimes less is more.
Emojis are already used as codewords in general and by various subcultures. Think eggplant.
Every generation thinks they invented language. I remember my grandpa once complaining about the slang usage of "cool" because it made no sense to him. A code produced by a machine can be broken by a machine. That's how computers were invented. But only humans and other intelligent life can create and use language.
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