Here’s the idea: you attach a QR code to your key ring that, when scanned, opens a texting window with “I found your keys!” set to send to the key owner’s phone. When I saw the instructions for this ...

Don’t you hate that feeling, the one you get when you have just realized that you have no clue where you may have left your keys? If you are unlucky enough to have lost them in a public place, odds ...

In the era of instant data exchange and growing risks of cyberattacks, scientists are seeking secure methods of transmitting information. One promising solution is quantum cryptography—a quantum ...

Losing your keys can be a terrible experience and while the best plan of attack is to retrace your steps, blogger celtwolf wanted a little more insurance, so he created a QR code for his keychain with ...

As previewed last year, Google Messages is beginning to roll out QR code-based key verification to confirm that you’re “communicating with the person you intend to.” Once available, open a ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...