Recently, Chen et al. [Quant Inf Proc doi: 10.1007/s11128-012-0505-5 ] presented a very promising quantum private comparison protocol for two participants to compare the equality of their wealth secretly - no one, except the participants, can reveal the comparison result. This paper points out that a malicious participant can reveal portion of the other participant's secret information. Furthermore, an improvement is also proposed.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Statistical and Nonlinear Physics
- Theoretical Computer Science
- Signal Processing
- Modelling and Simulation
- Electrical and Electronic Engineering