@techreport{weko_217052_1, author = "Wataru,Ohgai and Takao,Kondo and Korry,Luke and Satoshi,Kai and Keisuke,Uehara and Satoru,Tezuka", title = "Mutual Declaration Mechanism of Multi-provider Relationship for Trusted Web Services", year = "2022", institution = "Faculty of Policy Management, Keio University, Computer Security Incident Response Team, Keio University, Information Technology Center, Keio University, Keio Research Institute at SFC, Keio University, Faculty of Environment and Information Studies, Keio University, Faculty of Environment and Information Studies, Keio University", number = "16", month = "mar" }