Comment on “Quantum dense key distribution”

dense key distribution ”

In his Comment [1], Wójcik proposes two simple schemes for performing eavesdropping attacks to the Quantum Dense Key Distribution protocol (QDKD) in Ref. [2]. These schemes enable Eve to achieve a larger mutual information than Alice’s and Bob’s one, but maintaining inviolated the security condition (Eq. (6) in Ref. [2]). Eve’s attack in Wójcik’s schemes relies on the possibility of subtraction...

dense key distribution ”

In this Comment we question the security of recently proposed by Degiovanni et al. [Phys. Rev. A 69 (2004) 032310] scheme of quantum dense key distribution. PACS number(s): 03.67.Hk, 03.65.Ud

Comment on “A Random Quantum Key Distribution Achieved by Using Bell States”

In a recent paper [J. Opt. B: Quantum Semiclass. Opt. 5 (2003) 155-157], a quantum key distribution scheme based on entanglement swapping was proposed, which exhibited two improvements over the previous protocols. In this Comment, it is shown that the scheme has no properties as been discussed.

Quantum Key Distribution

Quantum Authenticated Key Distribution

Quantum key distribution algorithms use a quantum communication channel with quantum information and a classical communication channel for binary information. The classical channel, in all algorithms to date, was required to be authenticated. Moreover, Lomonaco [8] claimed that authentication is not possible using only quantum means. This paper reverses this claim. We design an algorithm for qu...