Kids love a secret. A code turns a plain note into something only the right person can read, which is exactly why passing one in class or hiding one in a treasure hunt feels like magic. Here are five simple codes to try at home, arranged from the easiest to the one that takes a little practice. None of them need anything more than paper, a pencil, and a few minutes.<\/p>\n\n\n\n
Start with the simplest one of all: write each word backwards. HELLO becomes OLLEH, and MEET ME AT SIX becomes TEEM EM TA XIS. Young children can crack this one by reading right to left, and it takes about ten seconds to teach. It is the perfect first code for a five- or six-year-old.<\/p>\n\n\n\n
To make it trickier, write the whole message as one long backwards string with no spaces, so the reader has to work out where the words break.<\/p>\n\n\n\n
Named after Julius Caesar, who really did use it, this code shifts every letter a set number of places along the alphabet. Shift by three and A becomes D, B becomes E, and so on, so CAT turns into FDW. The Roman historian Suetonius recorded Caesar using this exact three-letter shift to guard his private letters, which makes it one of the oldest recorded codes<\/a> in the world.<\/p>\n\n\n\n The person reading the message just shifts back by the same number. Pick your shift number together and keep it secret, since it works like a password. If you want to check a message quickly or set a harder shift, our Caesar Cipher tool<\/a> encodes and decodes it in a second.<\/p>\n\n\n\n Pigpen swaps each letter for a little symbol drawn from a grid, which makes a finished message look like a row of strange shapes. Kids love it because the output looks properly mysterious. Freemasons used it so widely in the 1700s that it is still called the Masonic cipher<\/a>, and Confederate soldiers even sent messages in it during the American Civil War.<\/p>\n\n\n\n Draw two tic-tac-toe grids and two X shapes, fill them with the alphabet, and each letter takes the shape of the lines around it. It takes a bit of setup, so it suits slightly older children. Our Pigpen Cipher tool<\/a> shows the full symbol chart if you want a reference to copy.<\/p>\n\n\n\n Atbash is one of the oldest codes on record. Hebrew scribes used it thousands of years ago, and it even hides the name Babylon as “Sheshach” in the Book of Jeremiah<\/a>. The idea is simple: flip the alphabet end to end, so A swaps with Z, B swaps with Y, C swaps with X, and on to the middle.<\/p>\n\n\n\n Because the swap works both ways, the same steps encode and decode a message, which makes it easier to use than it first looks. Write out the alphabet forwards on one line and backwards underneath, and you have a ready-made key. Our Atbash Cipher tool<\/a> flips a message for you if you want to check your work.<\/p>\n\n\n\n Morse turns every letter into a pattern of dots and dashes, and its best feature is that you do not have to write it at all. You can tap it on a table, blink it with a torch, or clap it across a room. SOS, the famous distress signal, is three dots, three dashes, three dots. When Samuel Morse sent the first long-distance message by his code in 1844, it read “What hath God wrought<\/a>.”<\/p>\n\n\n\n Morse takes the most practice of the five, so it rewards a child who wants a real challenge. Keep a chart nearby while you learn: our Morse code alphabet chart<\/a> has one with audio for each letter, and the Morse code translator<\/a> turns text into dots and dashes in a tap. Both sit inside our wider Cipher Hub<\/a>, which holds a dozen more codes to graduate to.<\/p>\n\n\n\n A code is best with a reason to use it. Set up a treasure hunt where each clue is written in a different cipher, start a secret club with a password shifted by Caesar, or leave Pigpen notes in a lunchbox. The codes above also make a gentle introduction to real cryptography and the logic behind it, which is a nice bonus hiding inside the fun.<\/p>\n\n\n\n3. The Pigpen cipher<\/h2>\n\n\n\n
4. The Atbash code<\/h2>\n\n\n\n
5. Morse code<\/h2>\n\n\n\n
Making it fun<\/h2>\n\n\n\n
Want more ciphers?<\/h2>\n\n\n\n