Nothing particularly secret there. Just one google search away: https://github.com/dropbox/zxcvbn

Hello everyone, I'm searching online but can't find any meaningful article, so I hope you can help or provide some links. We have an old ASP.NET WebForms app using Membership for login. Now we need to migrate it to ASP.NET Core API backend and React frontend. We cannot migrate it all at once, but step by step, so for some time we'll have both apps live in production. But we'd like to have single login for both apps. Login should be on new app, but when user logs in, he should also be logged in in old app. How can we do that? What should we do on both old and new app to accomplish that? Thank you