Readers of a certain age will remember those 'invisible ink' spy toys that let you write a 'secret' message which would only appear after rubbing the page with half of a lemon. Yeah, this is not that.

The Zodiac’s serial killer’s 340 cipher, which couldn’t be solved for 50 years, has been cracked by a remote team of mathematicians. A remote team of three hobbyist cryptologists have solved one of ...

What secret alchemical knowledge could be so important it required sophisticated encryption? The setting was Amsterdam, 2019. A conference organized by the Society for the History of Alchemy and ...

Ink containing polymers that can store data has been used to write a letter containing a hidden message – the encryption key to unlock a text file of L. Frank Baum’s The Wonderful Wizard of Oz. Eric ...

You could do worse than to confuse the meanings of "code" and "cipher"—even cryptographers sometime use the terms as though they had the same meaning. There is, however, a definite distinction between ...

The Diffie-Hellman algorithm was a stunning breakthrough in cryptography that showed cryptographic keys could be securely exchanged in plain sight. Here’s how it works. Whitfield Diffie and Martin ...