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Unconditional security by the laws of classical physics
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2013 (English)In: METROLOGY AND MEASUREMENT SYSTEMS, ISSN 0860-8229, Vol. 20, no 1, 3-16 p.Article in journal (Refereed) Published
Abstract [en]

There is an ongoing debate about the fundamental security of existing quantum key exchange schemes. This debate indicates not only that there is a problem with security but also that the meanings of perfect, imperfect, conditional and unconditional (information theoretic) security in physically secure key exchange schemes are often misunderstood. It has been shown recently that the use of two pairs of resistors with enhanced Johnson-noise and a Kirchhoff-loop - i.e., a Kirchhoff-Law-Johnson-Noise (KLJN) protocol - for secure key distribution leads to information theoretic security levels superior to those of today's quantum key distribution. This issue is becoming particularly timely because of the recent full cracks of practical quantum communicators, as shown in numerous peer-reviewed publications. The KLJN system is briefly surveyed here with discussions about the essential questions such as (i) perfect and imperfect security characteristics of the key distribution, and (ii) how these two types of securities can be unconditional (or information theoretical).

Place, publisher, year, edition, pages
2013. Vol. 20, no 1, 3-16 p.
Keyword [en]
information theoretic security, unconditional security, secure key exchange, secure key distribution, quantum encryption
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-202464DOI: 10.2478/mms-2013-0001ISI: 000318882300001OAI: oai:DiVA.org:uu-202464DiVA: diva2:634847
Available from: 2013-07-01 Created: 2013-06-24 Last updated: 2014-01-31Bibliographically approved

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Granqvist, Claes-Göran
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