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Springer eBooks

Background of Cryptographic Protocols

Ling Dong, Kefei Chen

Published Jan 1, 2012• 0 citations
Publisher
DOI
10.1007/978-3-642-24073-7_2

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When a quantum cryptographic system operates in the presence of background noise, security of the key can be recovered by a procedure called key distillation. A key-distillation scheme effective against so-called individual (bitwise-independent) eavesdropping attacks involves sacrifice of some of the data through privacy amplification. We derive the amount of data sacrifice sufficient to defend against individual eavesdropping attacks in both BB84 and B92 protocols and show in what sense the communication becomes secure as a result. We also compare the secrecy capacity of various quantum cryptosystems, taking into account data sacrifice during key distillation, and conclude that the BB84 protocol may offer better performance characteristics than the B92.
Abstract This paper analyzes some of the drawbacks of Bennett & Brassard’s quantum key distribution protocol when used in an educational setting introducing components of quantum cryptography. We propose to utilize a quantum bit commitment protocol instead in order to avoid the outlined difficulties. Additionally, we present implementations of the latter protocol in two different programming paradigms which may either be used as a practical demonstration tool for holding a quantum bit ballot, or as a means to foster an in-depth understanding of the cryptographic protocol amongst pupils with a background in computer science.