Paper 2015/1251

Comment on Quantum Cryptography---Which is More Important, Signal Security, Information Security or Communication Reliability

Zhengjun Cao and Zhenfu Cao

Abstract

Signal security aims to prevent the adversary from copying communication signals---so it is with quantum cryptography. Information security focuses on preventing the adversary from knowing plaintext or cheating users---so it is with classical cryptography. Communication reliability means that the intended receiver can recover the right communication signals sent by the sender. In this note, we stress that in the presence of an adversary quantum cryptography can do nothing except for detecting the presence, because the intrusion of adversary has to disturb communication signals so that the intended receiver can not recover the right signals. But classical cryptography works well in the presence of eavesdropping although it cannot detect it. We also remark that in the past decades the functionality of quantum cryptography to detect eavesdropping has been overstated. The plan to build a large quantum photonic network is infeasible.

Metadata
Available format(s)
PDF
Category
Foundations
Publication info
Preprint. MINOR revision.
Keywords
Signal securityinformation securitycommunication reliabilityquantum communication
Contact author(s)
caozhj @ shu edu cn
History
2016-01-02: received
Short URL
https://ia.cr/2015/1251
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2015/1251,
      author = {Zhengjun Cao and Zhenfu Cao},
      title = {Comment on Quantum Cryptography---Which is More Important, Signal Security, Information Security or Communication Reliability},
      howpublished = {Cryptology ePrint Archive, Paper 2015/1251},
      year = {2015},
      note = {\url{https://eprint.iacr.org/2015/1251}},
      url = {https://eprint.iacr.org/2015/1251}
}
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