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Cryptography

Decode secret messages and ciphers

5 RiddlesCryptography

Caesar Cipher: Decode the Message

Julius Caesar used a simple cipher to protect his messages: he shifted each letter forward by 3 positions (A→D, B→E, ... Z→C). Decode this message: ZKHUH WKHUH LV D ZLOO WKHUH LV D ZDB

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easyTeens (13-17)

ROT13: The Classic Internet Cipher

ROT13 rotates each letter by 13 positions. Because the alphabet has 26 letters, applying ROT13 twice returns the original message — it is its own inverse! Decode this message: GUR NAFJRE VF SBHEGRRA

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mediumAdults (18+)

Morse Code Message

Samuel Morse invented a code using dots (.) and dashes (-) to represent letters. Decode this Morse code message: -- -.-- ... . -.-. .-. . - .. ... ... .- ..-. .

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easyAll Ages

Mirror Writing

Leonardo da Vinci famously wrote his private notes in mirror script — reversed so they could only be read with a mirror. Can you decode this message without a mirror? .SDRAWKCAB NETTIRW SI EGASSEM SIHT

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hardAdults (18+)

The Substitution Cipher

In a simple substitution cipher, each letter is replaced by a fixed different letter. Below is an encoded message. The most common letter in English is E, the second most common is T, and 'XYZ' is a single-letter word. XYZ DTQUV HQZWR GZS OVQJ XYZ LAZZ

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