'Post-Quantum Cryptography': How Today's Encryption Could Be Obsolete Tomorrow

See that little padlock icon on top of your web browser? That's a signal to tell you that online services are using, and have properly set up HTTPS.

This web protocol encrypts the data you send across the internet when using that online service, as well as protecting all the responses of your interactions. In other words, it's a form of encryption to protect things like passwords, digital signatures, and other sensitive information.