Secure Communication with a Publicly Known Key |
| A. Beigea, B.-G. Englerta,b, Ch. Kurtsieferc and H. Weinfurtera,c aMax-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany bDepartments of Mathematics and Physics, Texas A & M University College Station, Texas 77843, U.S.A. cSektion Physik, Universitäat Müunchen, Schellingstrasse 4 80799 München, Germany |
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| We present a scheme for direct and confidential communication between Alice and Bob, where there is no need for establishing a shared secret key first, and where the key used by Alice even will become known publicly. The communication is based on the exchange of single photons and each and every photon transmits one bit of Alice's message without revealing any information to a potential eavesdropper. |
| DOI: 10.12693/APhysPolA.101.357 PACS numbers: 03.67.Dd, 42.79.Sz |