Bindings for Windows DPAPI, for protecting data on one device using Windows logon or machine credentials. These functions return cipertext for you to store in a file or some other place. If you want the plaintext to be stored in the OS, you may be looking for the keyring package, which is also more portable. This is only bindings to the two most used functions CryptProtectData and CryptUnprotectData, as Microsoft no longer recommends its use in .NET (with SecureString).