Cryptographic researchers have finally cracked a 51-year-old code left by the Zodiac, a serial killer who terrorized Northern California in the late 1960s and early 1970s. Much of the work of cracking ...

The keys are correct as stated, but instead of numbering duplicate letters from left to right, Agent Madeleine numbered them from right to left. You may want to complete the decryption yourself before ...

A coded message sent by a brutal serial killer who has never been caught has been cracked more than 51 years after it was sent. The male suspect, known as the Zodiac Killer, killed at least five ...