Public and private keys are the fundamental building blocks of secure transactions in the world of cryptocurrencies. These cryptographic instruments existed long before digital currencies were ...

For thousands of years, if you wanted to send a secret message, there was basically one way to do it. You’d scramble the message using a special rule, known only to you and your intended audience.

Allowing people into your home or property when you’re not there used to be either leaving a key under a doormat, or a complicated business of sending a set of keys by courier or asking a neighbour to ...