Apple teased the future of messaging during its Worldwide Developer Conference this week. The iOS 10 update is going to change the way you text (and sext) — and one feature in particular, invisible ...

Coded messages in invisible ink sound like something only found in espionage books, but in real life, they can have important security purposes. Yet, they can be cracked if their encryption is ...

People have always wanted to communicate privately. There once was a time when regular ink was secret enough, because not much of the world knew how to read. Then literacy ruined it for everyone, and ...

So you want to open sealed envelopes without getting caught? Here’s the secret, according to one of the six oldest classified documents in possession of the Central Intelligence Agency: “Mix 5 drams ...

Invisible inks based on “smart” fluorescent materials have been shining brightly (if only you could see them) in the data-encryption/decryption arena lately ...

Researchers have developed a rewriteable paper coating that can encrypt secret information with relatively low-tech invisible ink -- water. A message printed out by a water-jet printer on a ...

Coded messages in invisible ink sound like something only found in espionage books, but in real life, they can have important security purposes. Yet, they can be cracked if their encryption is ...