'Unbreakable' Encryption Unveiled
Researchers, at a scientific conference in Vienna, have unveiled the world's first computer network protected by unbreakable quantum encryption. Thanks to Joe and GuiltyDragon for the linkage.
These are typically based on complex mathematical procedures which are extremely hard for outsiders to crack, but not impossible given sufficient computing resources or time. But quantum systems use the laws of quantum theory, which have been shown to be inherently unbreakable.