Contains the data about the provider that authenticated an identity. This information is mostly public available and it simply consists of a unique provider ID and a unique key which identifies a user on this provider (userID, email, …). This information will be represented by the LoginInfo trait.
The authentication information contains secure data like access tokens, hashed passwords and so on, which should never be exposed to the public. To retrieve other than by Silhouette supported information from a provider, try to connect again with this information and fetch the missing data. Due its nature, the information will be represented by different implementations. Mostly every provider implementation defines its own AuthInfo implementation.