红外热成像测温技术在电气化铁路领域的应用

介绍了红外热成像测温技术的基本理论与原理,针对电气化铁路系统易出现的问题,着重分析了红外热成像测温技术在电气化铁路领域的应用与前景。     

Democratic group signatures with linkability from gap Diffie-Hellman group

Democratic group signatures(DGSs) attract many researchers due to their appealing properties, i.e., anonymity, traceability and no group manager.Security results of existing work are based on decisional Diffie-Hellman(DDH) assumption.In this paper, we present a democratic group signature scheme based on any gap Diffie-Hellman(GDH) group where DDH problem is easily but computational Diffie-Hellman(CDH) problem is hard to be solved.Besides the properties of ordinary DGSs, our scheme also provides the property of linkability, i.e., any public verifier can tell whether two group signatures are generated using the same private key.Security properties of our scheme employ a new and independently interesting decisional product Diffie-Hellman(DPDH) assumption which is weaker than DDH one.