Cryptography

Learn Morse Code

Invent and Decode Secret Ciphers and Codes

Decipher a Secret Code

Make Your Own Secret Language

Write in Code

Mirror Write

Make an Invisible Ink Pen

Fold a Note

Use Constrained Writing to Send a Secret Message

Encode and Decode Using the Vigènere Cipher

Create Substitution Ciphers

Make a Code Wheel

Decode a Caesar Box Code

Write in Pigpen Code

Make Invisible Ink with Baking Soda

Make a Secret Note

Write in Your Diary in Secret Code