4 Easy Ciphers Kids Can Learn Today
There’s a particular kind of quiet that happens when a kid gets handed a secret message. Even the wiggliest reader will sit still and squint at a string of numbers or backward letters. It looks like the most important document in the world to them. That’s the whole appeal of easy ciphers for kids to try at home. A code turns “read this” into “crack this.” Reading suddenly becomes the fun part instead of the chore part.
Pippa and the Secret Saints is a brand new mystery cipher book. Pippa cracks codes like these to track down the story of a different saint in every chapter. Wondering what a good cipher is for kids to start with? Here are four, easiest to trickiest. There’s a free tool at the end too, where your kids can test their skills without you doing any of the work yourself.
REVERSE WORDS: The simplest cipher for kids just starting out
If you want to know whether a kid is ready for codes at all, start here. A reverse word cipher just flips the order of the letters in each word. MEET ME AT NOON becomes TEEM EM TA NOON. That’s it. No key to memorize, no chart to reference — just read it backward.
This is exactly the kind of simple cipher for kids just starting out. It’s one they can actually solve on their own, on the first try. A cipher that’s too hard on day one works against you. It’s the fastest way to make a kid decide codes aren’t for them.
NUMBER CODE: How to make a secret code for kids in 5 minutes
Once reverse words feels easy, move to numbers. Assign each letter of the alphabet a number — A is 1, B is 2, and so on through Z at 26. Then write the message in numbers instead of letters. MEET ME AT NOON becomes 13-5-5-20 13-5 1-20 14-15-15-14.
This is genuinely how to make a secret code for kids in one sitting. Write the alphabet across the top of a piece of paper, number it, and you have a working cipher key. Kids like this one because they can build their own version — shift the numbering, skip letters, whatever they want. It’s still theirs.
CAESAR SHIFT: A classic among codes and ciphers for kids
The Caesar shift is named for Julius Caesar, who really did use it to send military messages. Pick a number, then shift every letter in the alphabet forward that many spots. Write the message using the shifted alphabet. With a shift of 3, A becomes D, B becomes E, and MEET becomes PHHW.
Out of all the codes and ciphers for kids to try, this is the one that feels the most like “real” cryptography. That’s mostly because it comes with an actual historical story attached. Kids like knowing a code they’re using is one a real person used to keep real secrets.
SUBSTITUTION CIPHER: For kids ready for a bigger challenge
This is the top of the ladder. Instead of a predictable shift, every letter gets swapped for a completely different letter or symbol. You and your kid make up the key together. A might become Q, B might become Z. There’s no pattern to guess, which makes it the hardest to crack without the key in hand.
Substitution ciphers are the best of the cipher activities for kids who’ve already mastered the first three. They’re for kids who want something that actually stumps them. It’s also the closest thing to a real spy’s code. For a certain kind of kid, that’s the whole point.
Turn it into a secret code game for kids
Paper and pencil works fine for these easy ciphers for kids to try at home. But there’s a moment in every cipher session where a kid gets a letter wrong three words in, and the whole message falls apart. That’s usually where the fun ends if nobody’s there to help troubleshoot.
I built a free tool for exactly that moment. Pippa’s Secret Decoder lets kids type in a message and try any of these four ciphers. It checks their work instantly instead of letting them get stuck halfway through. It’s one of the better secret code games for kids precisely because it doesn’t do the solving for them. It just tells them when they’ve got it right.
READY FOR A REAL MYSTERY?
If your child finishes all four of these and wants more, that’s exactly what Pippa and the Secret Saints was built for. Each chapter follows Pippa as she cracks a real cipher, including all four covered here. She uses them to uncover the story of a different Catholic saint, from Carlo Acutis to Joan of Arc. It’s a puzzle book and a saint story in the same chapter. It’s built for kids around ages 9 to 12.
These are easy ciphers for kids to try at home. Whichever one your kid falls in love with first is the one to bring to the kitchen table this weekend. Codes are better with company anyway.
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