In slightly less technical terms, researchers at the Toshiba Research Europe facility in Cambridge, England have figured out how to make it harder for eavesdroppers to steal keying information from a quantum cryptosystem (registration required, Bugmenot has login credentials for this site). For an attacker to have a chance at breaking a quantum cryptosystem, he or she would have to splice a tap into the optical fibre which connects the two crypto units and record the pulses of light that encode the key used to encrypt the data. There are ways to use the principles of quantum mechanics to detect …