Fortunately, they are likely wrong. Large universal quantum computers could break several popular public-key cryptography (PKC) systems, such as RSA and Diffie-Hellman, but that will not end encryption and privacy as we know it. ... Privacy is unlikely to die in a quantum apocalypse anytime soon.

Can quantum computers break cryptography?

As it turns out, quantum computers can theoretically be used to break all existing implementations of asymmetric cryptography — not only RSA, but Diffie-Hellman and elliptic curve cryptography as well. Interestingly, symmetric cryptography, the less mathy encryption scheme, is not as vulnerable.

How will quantum computing affect cryptography?

Quantum computer and encryption experts are not communicating with one another as much as they should. This means that discrete advances in quantum computing may happen with a slight lag in how encryption would operate.