Toshiba Makes Quantum Encryption Breakthrough

    Date21 Feb 2007
    CategoryCryptography
    4702
    Posted ByBill Keys
    A loophole in quantum cryptography that could allow a hacker to determine a secret key transmitted using the technology has been closed by new research.

    Working at Toshiba Research Europe in Cambridge, scientists found that laser diodes used to transmit keys used to encrypt data, known as Quantum Key Distribution (QKD), sometimes transmitted more than one photon at a time. Quantum encryption works by transmitting key data as a stream of single photons.

    Should an eavesdropper try to intercept the transmission, monitoring a single photon would change the state of that photon, and this would make both ends of the transmission aware that the data had been eavesdropped. However, the laser diodes can sometimes transmit more than one photon and so a hacker could monitor the second photon, leaving the first photon unchanged and this would not alert anyone that the key transmission had been compromised.

    You are not authorised to post comments.

    LinuxSecurity Poll

    Has your email account ever been pwned in a data breach?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 2 answer(s).
    /component/communitypolls/?task=poll.vote
    12
    radio
    [{"id":"53","title":"Yes","votes":"8","type":"x","order":"1","pct":88.89,"resources":[]},{"id":"54","title":"No","votes":"1","type":"x","order":"2","pct":11.11,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
    bottom200

    We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.