System.Security.Cryptography.CspProviderFlags public enum CspProviderFlags Documentation CreateEphemeralKey = 128 NoFlags = 0 NoPrompt = 64 UseArchivableKey = 16 UseDefaultKeyContainer = 2 UseExistingKey = 8 UseMachineKeyStore = 1 UseNonExportableKey = 4 UseUserProtectedKey = 32