Easy Englit for STEM grads:
Recently, the notion of a secret code in the Bible came up in passing. It was certainly a researchable idea. It is possible to code a surprising amount of information in a book, pamphlet, or note (which already features specified complexity) by specifying which elements will also be part of the secondary meaning.
A really simple way of doing that is to write a comprehensible poem where the first or any specified letter of each line spells out a word or name in order or scrambled (acrostic poem).
Here’s one, first letter, each line, written for a child.
Obviously if anyone not a child suspected there was a hidden message in your work, and the situation was serious, you’d have to be cleverer than that. 😉
For sleepless nights: unbroken Dorabella cipher