29 September 2006 Security aspects of the authentication used in quantum key growing
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Unconditionally secure message authentication is an important part of Quantum Cryptography (QC).We analyze security effects of using a key obtained from QC in later rounds of QC. It has been determined earlier that partial knowledge of the key in itself does not incur a security problem. However, by accessing the quantum channel used in QC, the attacker can change the message to be authenticated. This, together with partial knowledge of the key does incur a security weakness of the authentication. We suggest a simple solution to this problem, and stress usage of this or an equivalent extra security measure in QC.
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Jörgen Cederlöf, Jörgen Cederlöf, Jan-Åke Larsson, Jan-Åke Larsson, } "Security aspects of the authentication used in quantum key growing", Proc. SPIE 6399, Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays, 63990H (29 September 2006); doi: 10.1117/12.689682; https://doi.org/10.1117/12.689682


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