In recent days, Shanghai CA joined in the proseminar held by Shanghai information committee,the Office of the State Cipher Administration Committee and Shanghai network trust system construction group.Participants at meeting communicated on the themes of how to build Shanghai's network trust system and how to realize CA's mutual communication of Yangtze River delta. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　From ：ShanghaiCA