Mitsubishi has successfully realized quantum cryptographic communication systems as a security system.
TOKYO - Mitsubishi Electric Corp. and the Research Institute
for Electronic Science, Hokkaido University, announced today the success of their quantum cryptographic experimental
This is the first report in Japan concerning quantum cryptosystem experiments for absolute security against
Quantum cryptography provides secure key distribution and cryptographic communication owing to the instant detection
of eavesdroppers on communication channels.
Quantum cryptography is based on the fundamental physical law that observation by eavesdroppers inevitably affects
the quantum system and the information of the system before observation, making the information incomplete.
That is, once communication content is tapped on the channel, the content itself changes irreversibly. The eavesdropped
content, then, becomes meaningless and the legitimate recipient can detect the eavesdropper by the change in content.
Thus the legitimate initiator and recipient are able to take measures against eavesdropping.
Mitsubishi has already developed linear cryptanalysis, the block cipher MISTY, which has provable security,
and public key cryptosystems such as elliptic curve cryptography.
Recently KASUMI, based on the design of MISTY, has been adopted as the global standard algorithm for use in
next-generation cellular phones (W-CDMA).
Mitsubishi Electric will take the next step and apply quantum cryptography to installed fibers for general telecommunication
use and make the bit rate (transmission speed) higher.