In this recipe, we used a simple authentication flow type, based on a username and password. However, you can also utilize the additional security of Secure Remote Password protocol for additional security. Currently, SRP support is only available for the iOS, Android, and JavaScript SDKs. 

We explored the use of server-side authentication flow and client-side authentication flow in the last two recipes. There are additional flows, such as the custom authentication flow and the user migration authentication flow. You can refer to the link to Amazon Cognito User Pool Authentication Flow provided in the See also section.