On the Security of Y-00 under Fast Correlation and Other Attacks on the Key

Details On the Security of Y-00 under Fast Correlation and Other Attacks on the Key On the Security of Y-00 under Fast Correlation and Other Attacks on the Key

2006-08-02

arxiv.org/abs/quant-ph/0608028v2

Physics

Quantum Physics

Scientific paper

The potential weakness of the Y-00 direct encryption protocol when the encryption box ENC in Y-00 is not chosen properly is demonstrated in a fast correlation attack by S. Donnet et al in Phys. Lett. A 35, 6 (2006) 406-410. In this paper, we show how this weakness can be eliminated with a proper design of ENC. In particular, we present a Y-00 configuration that is more secure than AES under known-plaintext attack. It is also shown that under any ciphertext-only attack, full information-theoretic security on the Y-00 seed key is obtained for any ENC when proper deliberate signal randomization is employed.

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