A procedure that identifies the presence and amount of a substance (such as a marker or taggant) in a particular composition.

Asymmetric Cryptography

A process that uses a pair of related keys – one public and one private – to encrypt and decrypt a message and protect it from unauthorised use.


Using a wristwatch as an example, an analogue watch uses the movement of hands over a dial to represent passing time. It’s not the same thing as time itself, but an analogy of time. Same thing with a ruler – that little strip of wood is a representation of your...