Top 20 NuGet secret Packages

ASP.NET HTTP module for the Secret Server SDK. Retrieve secret values on demand using placeholders in your application config file. Requires a working installation of the Secret Server client tool in a local directory. Recommended for legacy ASP.NET applications (4.6 and below). For ASP.NET 4.6.1 an...
Transform Azure KeyVault macros into their respective values during local development
You tell me something and I give you back a secret.
A cryptographic library useful for securing communications using HMAC SHA256
ASP.NET HTTP module for the Secret Server SDK. Retrieve Secret values on demand using placeholders in your application config file. Requires ASP.NET 4.6.1 and above. For ASP.NET 4.6 and below, use the Client.HttpModule package.
Extends WebJobs 3 and Azure Functions 2 to enable transforming Azure KeyVault macros into their respective values during local development from local.settings.json and other configuration sources.
A Library for managing application configurtion in TOML file format.
Splits up secrets using Shamir's thresholding secret-sharing scheme
A .NET implementation of Shamir's Secret Sharing
Cryptographic functions for .NET Crypto .NET is an AES CBC and AES CBC HMAC SHA512 .NET wrapper which makes it easy to encrypt data, objects and files. The library is currently compiled at .Net 4.0 so it should work with any application running .Net 4.0 and above.
A sample showing how to use SecretSplitter to split up a secret and SecretCombiner to recover it.
The library provides the necessary encryption key management and protection using a combination of ssl certificates, blob and table storage in order to offer cryptographic services to Azure Websites
A .NET client library for using HashiCorp's Vault server.
.NET Core configuration provider for HashiCorp Vault
DataProtection method using AES encryption and a string secret. I just got annoyed by the limited file system or Azure options I had.