Locked out? Lost your spare? Key not working right? Don’t call a locksmith — fix it yourself! Spare keys are great because they can come in handy in an emergency. Preparation is key, so don’t wait ...

A private key, also known as a secret key, is a cryptographic key that is used to decrypt or digitally sign data. It is a crucial component in asymmetric encryption algorithms like RSA and ECC ...

The original version of this story appeared in Quanta Magazine. 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 ...