Direct Use of Secret Key in Quantum Cryptography

Details Direct Use of Secret Key in Quantum Cryptography Direct Use of Secret Key in Quantum Cryptography

2006-03-29

arxiv.org/abs/quant-ph/0603264v2

Physics

Quantum Physics

To be submitted to Phys. Rev. Lett

Scientific paper

For single-photon quantum key generation between two users, it is shown that the use of a shared secret key extended via a pseudo-random number generator may simultaneously enhance the security and efficiency of the cryptosystem. This effect arises from the intrinsic performance difference between quantum detectors with versus without knowledge of the key, a purely quantum effect and a new principle for key generation. No intrusion level estimation is needed and the method is directly applicable to realistic systems with imperfections. Quantum direct encryption is also made possible by such use of a secret key.

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