- Quantum cryptography is the ultimate example of small-is-beautiful technology: information is encoded at the subatomic level on individual photons, the smallest known units of light. They can then be sent on optical fibre networks from one computer to another. To snoop on such messages undetected, a hacker would have to defy the laws of quantum mechanics.
They say this now, once released:

PR: "We have a found a flaw, buffer overflow if u will, and hackers can exploit it, so Patch it"