此屬性指定 SOAP 接收器支援的認證機制。認證機制提供使用者認證，以及資料完整性和加密。依預設，會選取所有可用的認證機制。如果未選取一個認證機制，且 Web 服務使用者 (WSC) 使用它來傳送請求，將拒絕請求。以下是支援的認證機制的清單：
urn:liberty:security:2003-08:null:null
urn:liberty:security:2003-08:null:X509
urn:liberty:security:2003-08:null:SAML
urn:liberty:security:2004-04:null:Bearer
urn:liberty:security:2003-08:TLS:null
urn:liberty:security:2003-08:TLS:X509
urn:liberty:security:2003-08:TLS:SAML
urn:liberty:security:2004-04:TLS:Bearer
urn:liberty:security:2003-08:ClientTLS:null
urn:liberty:security:2003-08:ClientTLS:X509
urn:liberty:security:2003-08:ClientTLS:SAML
urn:liberty:security:2004-04:ClientTLS:Bearer