Important data can be stored and concealed quite easily in ordinary plastic using 3D printers and terahertz radiation, scientists show. Holography can be done quite easily: A 3D printer can be used to ...

One of the spy technologies that's come to light in the recently-exposed alleged Russian spy ring is steganography, a word that comes from the Greek for “covered writing.” It’s a way to hide ...

There are many ways to store data - digitally, on a hard disk, or using analogue storage technology, for example as a hologram. In most cases, it is technically quite complicated to create a hologram: ...