Found on The New Scientist (via Fark):First quantum cryptography network unveiled Quantum Cryptograhy is the holy grail of security professionals. The only thing that could possibly crack it would be a quantum computer. Of course, both are theoretically possible, but have been thought as yet impractical. The installation in the article is still somewhat impractical (i.e. large, expensive and custom-made), but more functional than I had previously known. The biggest concern I have about their implementation would be that while it is difficult (but not impossible) to intercept the data without being detected, what if stealing the data undetected is not the goal? What if the goal is the disruption of the system to the point that is becomes unusable? That would be orders of magnitude easier than stealing the data, and possibly force the users to revert to the older, and less secure, encryption methods. Not that I have any plans, or anything. I just want the scientists and engineers developing such things to think through all of the scenarios before my bank starts using them.