Microsoft Azure KeyVault key encryption support. This library has been replaced by the following new Azure SDK. https://www.nuget.org/packages/Azure.Extensions.AspNetCore.DataProtection.Keys It is recommended that you move to the new package. This package was built from the source code at https://github.com/aspnet/AspNetCore/tree/d1fa2cb155ab9226f20b87ab0d7a1eb16b8a8b69