Invisible ink is one of the most popular methods to send secret messages, created with recipes using substances like milk, ...

A German Army Enigma transmission from 85 years ago, known as the MVUEH message, has been cracked by GTP-Astra in just two days.

A woman in Maryland discovered a coded message hidden within the pages of a secondhand book bought for her by her mother. Sydney, from Baltimore, had been eager to read La Belle Sauvage by Philip ...

Usually, a story about hacking a coded message will have some computer element or, at least, a machine like an Enigma. But [Ruth Selman] recently posted a challenge asking if anyone could decrypt an ...

A coded letter from the Zodiac Killer was finally deciphered after over 50 years. A code breaking team tested thousands of ways to crack the code on one of the killer's messages from the late 1960s.

A coded letter carrying a message from Napoleon Bonaparte to one of his senior generals has been cracked by AI after 217 years.

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A woman in Maryland discovered a coded message hidden within the pages ...