In this paper, a multi-party quantum private comparison (MQPC) scheme is
suggested based on entanglement swapping of Bell entangled states within
d-level quantum system, which can accomplish the equality comparison of secret
binary sequences from n users via one execution of scheme. Detailed security
analysis shows that both the outside attack and the participant attack are
ineffective. The suggested scheme needn't establish a private key among n users
beforehand through the quantum key distribution (QKD) method to encrypt the
secret binary sequences. Compared with previous MQPC scheme based on d-level
Cat states and d-level Bell entangled states, the suggested scheme has distinct
advantages on quantum resource, quantum measurement of third party (TP) and
qubit efficiency.Comment: 8 pages, 1 figure, 1 tabl