Widely used encryption algorithms like RSA and elliptic-curve cryptography (ECC) will be pointless. Depending on who is running the quantum computers, they will turn from superhero to supervillain.

The common, fairly simple encryption algorithm "MD5 was launched over 20 years ago and is still the most common implementation I see in the wild, though it’s gone from being relatively expensive ...

Security researchers have successfully broken one of the most secure encryption algorithms, 4096-bit RSA, by listening -- yes, with a microphone -- to a computer as it decrypts some encrypted data ...

Proponents believe hybrid encryption compensates for weaknesses in single post-quantum algorithms, but performance, complexity, and security concerns remain.