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... tion to make it unrecognizable to others.
Simple ones include popular acrostic poems;
Stepping up the difficulty, there is the Caesar cipher;
Further up is the codebook used by telegraphs;
And the pinnacle, symbolizing human technological achievements, computer encryption.
All these things are encompassed within the essence of coded messages.
If they have one thing in common,
—pattern.
To be precise, it is using predetermined rules ...
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