Comment on "Exposed-Key Weakness of Alpha-Eta" [Phys. Lett. A 370 (2007) 131]

Details Comment on "Exposed-Key Weakness of Alpha-Eta" [Phys. Lett. A 370 (2007) 131] Comment on "Exposed-Key Weakness of Alpha-Eta" [Phys. Lett. A 370 (2007) 131]

2007-12-07

arxiv.org/abs/0712.1092v6

Phys. Lett. A 372 (2008) 7091-7096

Physics

Quantum Physics

Published version

Scientific paper

10.1016/j.physleta.2008.10.037

We show that the insecurity claim of the AlphaEta cryptosystem made by C. Ahn and K. Birnbaum in Phys. Lett. A 370 (2007) 131-135 under heterodyne attack is based on invalid extrapolations of Shannon's random cipher analysis and on an invalid statistical independence assumption. We show, both for standard ciphers and AlphaEta, that expressions of the kind given by Ahn and Birnbaum can at best be interpreted as security lower bounds.

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