Can you crack this famous unsolved cipher, created by the Zodiac Killer over 40 years ago? Try it!<br>Click a cipher symbol, then type the letter you want to substitute. I'll show you common words and<br>statistics. Go to zodiackillerciphers.com for more info.

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Randomize |<br>Reset |<br>Toggle stats |<br>Switch to 408 cipher |<br>Switch to 340 cipher |<br>Flip horizontally |<br>Flip vertically |<br>Rotate left |<br>Rotate right |<br>Find repeated sequences |<br>Dump n-grams (all) |<br>Dump n-grams (repeats only) |<br>Dump alphabet stats |<br>CryptoScope (NEW!) |<br>Zodiac Typewriter (NEW!) |

Technical caveat: I am assuming this is a simple monoalphabetic homophonic substitution cipher, and not something much harder like a transposition cipher or a polyalphabetic substitution cipher. The only reason I am assuming this is because the first 3-part cipher Zodiac sent to the newspaper was solved using homophonic substitution with a single alphabet (to see this, click the "Switch to 408 cipher" link above, and click the decoder named "The correct one").

Click here to view a high-resolution image of the 340 cipher.

Click here to read the Zodiac Ciphers wiki, a new repository of information related to the Zodiac ciphers.

Update History

08/01/2012:

Added Zodiac Typewriter

06/01/2012:

Minor cleanup

09/30/2011:

Boatload of new CryptoScope features

09/19/2011:

Fixed zkdecrypto link

Fixed letter assignment/delete bug

Improved contrast of plaintext letters vs cipher symbols

12/31/2010:

Added CipherScope, an advanced ciphertext exploration utility.

12/11/2010:

Fixed transcription errors in the 408 ciphertext

In the 340, replaced I with bar symbol, since it looks different enough from the I in the 408.

Added link for displaying the cipher symbol statistics

Added this update section

Added link to Zodiac Ciphers wiki

Older updates:

Added links to dump n-gram statistics for repeated and non-repeated inline sequences

Added link to find repeated sequences that occur in any orientation in the current ciphertext

ZodiacKillerCiphers.com | CryptoScope |<br>Old version of webtoy | zkdecrypto cipher-cracking software | Email me at doranchak at gmail<br>dot com if you find anything interesting or have any comments/suggestions! | Oranchak.com

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