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News Link • Hacking, Cyber Security

Laws of Physics Say Quantum Cryptography Is Unhackable. It’s Not

 A technique called quantum cryptography can, in principle, allow you to encrypt a message in such a way that it would never be read by anyone whose eyes it isn’t for.

Enter cold, hard reality. In recent years, methods that were once thought to be fundamentally unbreakable have been shown to be anything but. Because of machine errors and other quirks, even quantum cryptography has its limits.

“If you build it correctly, no hacker can hack the system. The question is what it means to build it correctly,” said physicist Renato Renner from the Institute of Theoretical Physics in Zurich, who will present a talk on calculating the failure rate of different quantum cryptography systems at the 2013 Conference on Lasers and Electro-Optics in San Jose, California on June 11.

Regular, non-quantum encryption can work in a variety of ways but generally a message is scrambled and can only be unscrambled using a secret key.

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