Intercept-resend attacks on Chen et al.'s quantum private comparison protocol and the improvements

Jason Lin, Hsin Yi Tseng, Tzonelih Hwang

Research output: Contribution to journalComment/debatepeer-review

73 Citations (Scopus)


Recently, Chen et al. presented a novel quantum private comparison (QPC) protocol using triplet GHZ state to enable two parties to compare the equality of their information without revealing the content. The protocol is rather promising because it only requires single-photon measurement with the help of a semi-honest third party to complete the secret comparison. However, this study will point out that a weakness could occur in the eavesdropping check phase. That is, an intercept-resend attack could be launched by one of the two participants to reveal the information content of the other participant-a result that contradicts to the security requirement of a QPC. Fortunately, two solutions are possible to avoid the attack.

Original languageEnglish
Pages (from-to)2412-2414
Number of pages3
JournalOptics Communications
Issue number9
Publication statusPublished - 2011 May 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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