<PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.2" />

System.Configuration.ProtectedConfigurationSection

Provides programmatic access to the configProtectedData configuration section. This class cannot be inherited.
namespace System.Configuration { public sealed class ProtectedConfigurationSection : ConfigurationSection { public ProviderSettingsCollection Providers { get; } public string DefaultProvider { get; set; } public ProtectedConfigurationSection(); } }