Comment on: 'How much security does Y-00 protocol provide us?' [Phys. Lett. A 327 (2004) 28]

Horace P. Yuen, Prem Kumar, Eric Corndorf*, Ranjith Nair

*Corresponding author for this work

Research output: Contribution to journalComment/debatepeer-review

15 Scopus citations


It is claimed by T. Nishioka et al. in [T. Nishioka, T. Hasegawa, H. Ishiziuka, K. Imafuku, H. Imai, Phys. Lett. A 327 (2004) 28-32] that the security of Y-00 is equivalent to that of a classical stream cipher. In this Letter it is shown that the claim is false in either the use of Y-00 for direct encryption or key generation, in all the parameter ranges it is supposed to operate including those of the experiments reported thus far. The security of Y-00 type protocols is clarified.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number1-3
StatePublished - Oct 10 2005


  • Quantum cryptography

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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