I'm working on a project in asp.net mvc. I want to authenticate users using Asp.Net Identity and Owin. I'm aware that Identity has its own tables which are created using code first approach. However, I want Identity to connect to our existing database which has existing non identity tables. Is that possible ? Thank you.
Yes it is possible, asp.net identity it's extensible.
I think this link fits your needs.
Probably you need to implement your custom userstore at least and, depending on your current data structure, maybe you'll have to modify some entities.
Hope this helps!