This Unbreakable CIA Cipher Fooled the World for 37 Years. Then Two People Accidentally Solved It.

A single leaked hint exposed the CIA's most puzzling code. But dozens of the world's toughest ciphers are still waiting to be solved.

View in Browser  DIGITAL ISSUES GEAR REVIEWS SUBSCRIBE This Unbreakable CIA Cipher Fooled the World for 37 Years. Then Two People Accidentally Solved It. A single leaked hint exposed the CIA's most puzzling code. But dozens of the world's toughest ciphers are still waiting to be solved. Read More Archaeologists Found a Tooth and Bones That Challenge Assumptions About Christianity Tangled in the roots of an ancient tree, the remains almost stayed lost forever—until now. Read More Scientists Discovered Ancient DNA That Could Change Prehistory Forever The genetic link between bones discovered thousands of miles away from each other suggests a prehistoric migration route. Read More Travel Safely With These Top Editor-Tested Car Emergency Kits Stay prepared for anything your next road trip might throw at you. Read More A 10-Year-Old Girl Went for a Walk on the Beach—and Stumbled Upon 5 Dinosaur Footprints Beats finding a seashell. Read More After 2,100 Years, Archaeologists Found the Missing Head of an Ancient Greek Statue The goddess of health is whole again. Read More Need Assistance? Contact Us. Follow Us Unsubscribe | Manage Preferences | Privacy Notice | CA Notice at Collection Popular Mechanics is a publication of Hearst Magazines. ©2025 Hearst Magazine Media, Inc. All Rights Reserved. This email was sent by Hearst Magazines, 300 West 57th Street, New York, NY 10019-3779