Semi-quantum private comparison protocol under an almost-dishonest third   party
  This study presents the first semi-quantum private comparison protocol under an almost-dishonest third party. The proposed protocol allows two classical participants to compare their secret information without compromising it's privacy. The security analyses indicate that the protocol is free from several well-known attacks. 
Wen-Han Chou, Tzonelih Hwang, Jun Gu
quant-ph