Key generation: Foundations and a new quantum approach

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55 Scopus citations


The fundamental security and efficiency considerations for fresh key generation will be described. It is shown that the attackers optimal probability of finding the generated key is an indispensable measure of security and that this probability limits the possibility of privacy amplification and the amount of fresh key that can be generated. A new approach to quantum cryptography to be called keyed communication in quantum noise (KCQ) is developed on the basis of quantum detection and communication theory for classical information transmission. KCQ key generation schemes with coherent states of considerable energy will be described. The possibility of fresh key generation is demonstrated for binary and N-ary detection systems under heterodyne attacks. The security issues of these schemes will be discussed and compared with BB84. The emphasis throughout is on concrete finite bit-length protocols.

Original languageEnglish (US)
Article number5337948
Pages (from-to)1630-1645
Number of pages16
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number6
StatePublished - Nov 2009


  • Information-theoretic security
  • Key generation
  • Quantum cryptography

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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