Silo season 2 makes the Caeser shift cipher a crucial part of one of its main story beats, raising many questions surrounding what it means and how Lukas uses it. Although a lot has been happening ...

The Caesar cipher is what’s known as a substitution cipher, because each letter is substituted with another one; other variations on this, then, would substitute letter blocks or whole words.

So, for example, if you read an entire paragraph and notice that the letter D appears more often than any other, odds are that it used a Caesar cipher with a shift of 1 (making E a D in the code).