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Learn 5 Secret Codes for Kids to Write a Coded Letter

Oh how I loved secret codes when I was a kid.  The ability to write a coded letter without anyone but the recipient was just plain fun.

Today on Kids Activities Blog we have 5 secret codes for kids to write their own coded letter.

secret codes for kids to write a coded letter - envelope with the word confidential written stamped on the outside - Kids activities blog
Let’s write a secret code!

5 Secret Codes for Kids

1.  Reverse the Words

types of code backwards - reverse the words
Read this secret code backwards

This is a simple code to solve – just read the words backwards!  Even though it seems simple once you know the secret, it can be a hard one to figure out when you don’t.


Answer: Have a fun summer

Half reversed alphabet ciper written out on notebook paper - Kids Activities Blog - ABCDEFGHILJLM on top line with NOPQRSTUVWXYZ on bottom line
Top line is first half of alphabet and second line is the second half for this cipher.

2.  Half-Reversed Alphabet

Write out the alphabet letters from A to M then write the letters from N to Z directly below them. Simply exchange the top letters for the bottom letters and vice versa.

Decode: QBT

Answer: DOG

Block cipher letters a-e - Kids Activities Blog - secret code to write
A block cipher always has a key.

3.  Block Cipher

Write the message in a rectangular block, one row at a time – we used 5 letters in each row (alphabet letters in order A-E).

Can you figure out what the KEY is to the block cipher pictured above? Each letter is shifted one place in the second row. You can make any key correspond to the rows making it as simple or complex to figure out. Then write down the letters as they appear in the columns.

Decode: AEC

Answer: BAD

4.  Read Every Second Letter

code 2 - read every second letter in the message
Rotate through this code until all the letters are used.

Read every second letter starting at the first letter, and when you finish, start again on the letters you missed.

Decode: WEEVLEIRKYE – STUOMCMAEMRP (mistake made on lower line)

Answer: We Like to camp every summer

5.  PigPen

The PigPen code is easier than it looks and is my children’s favorite.  First, draw out the two grids below and fill in the letters:

pigpen code key - coded letter alphabet
Here is your code key for pigpen.

Each letter is represented by the lines around it (or pigpen).


Decode: image above


Write a Coded Letter

We practiced writing our names and silly words before moving to coding whole sentences.

The letters and messages you can write can be fun, but make sure you send along a key so the recipient can figure it all out!

Want More Writing Fun? We Have Plenty of Activities:

How did your coded letter turn out? Did you keep your message a secret?

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