H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/08 (2006.01)
Patent
CA 2169746
In a communication system using quantum cryptography for the distribution of a key, two stations each independently modulate a single-photon signal. The single-photon signal is transmitted to the two stations from an external source, and passes through the stations in series. The signal subsequently passes onto a third station which detects the state of the signal, and compares it with the state of the signal as originally transmitted. This third station communicates the results of the comparison to the two stations, and the two stations establish a shared secret key for the subsequent encryption of traffic between the stations. Both the source of the single-photon signal and the single-photon detector may be combined in a transmitter station (Alice).
Dans un système de communication faisant appel à la cryptographie quantique et s'appliquant à la répartition d'une clé, deux stations modulent chacune indépendamment un signal à photon unique. Le signal à photon unique est transmis aux deux stations à partir d'une source externe, et traverse les stations en série. Le signal passe ensuite sur une troisième station qui détecte l'état du signal et le compare à sa première transmission. Cette troisième station communique les résultats de la comparaison aux deux stations, et les deux stations établissent une clé secrète commune destinée au chiffrage ultérieur du trafic entre les deux stations. La source du signal à photon unique et celle du détecteur à photon unique peuvent être combinées en une station émettrice (Alice).
Barnett Stephen Mark
Phoenix Simon James Daniel
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
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