<PackageReference Include="System.ServiceModel.Http" Version="6.0.0-rc.23205.4" />

System.ServiceModel.MessageSecurityOverHttp

namespace System.ServiceModel { public class MessageSecurityOverHttp { public MessageCredentialType ClientCredentialType { get; set; } public bool NegotiateServiceCredential { get; set; } public SecurityAlgorithmSuite AlgorithmSuite { get; set; } public MessageSecurityOverHttp(); protected virtual bool IsSecureConversationEnabled(); } }