On the security of arbitrated quantum signature schemes

摘要: Due to the potential capability of providing unconditional security, arbitrated quantum signature (AQS) schemes, whose implementation depends on participation a trusted third party, received intense attention in past decade. Recently, some typical AQS schemes were cryptanalyzed and improved. In this paper, we analyze security property show that all previous no matter whether original or improved, are still insecure sense messages corresponding signatures can be exchanged among different receivers, allowing receivers deny having accepted an appointed message. Some further improved methods also discussed.