Cryptanalysis and improvement of several quantum private comparison protocols

Zhao-Xu Ji,Pei-Ru Fan,Huan-Guo Zhang,Hou-Zhen Wang

Table 1. Comparison with Wu et al's solutions.

Wu et al's Wu et al's Our solution 1 solution 2 solution additional keys √ √ × hash functions √ × × unitary operations × √ ×