We have a application that has calls a Authentication Service to authenticate users using username and password (Hashing, encryption etc.) its working fine, but now we are expanding and creating few new applications and we want to use this Authentication Service as a SSO.
I have watched many tutorials but they all use some pre-built SSO, which in my case we can't company policy.
So in searched I found about JWT and OAuth2, and spring-security out of box sso and but don't know where to begin to build our own/custom sso and what are the pre-requisite's.
Any help will be appreciated.
I know this question is very vast, but trust me I have tried searching whole day, but can't seem to find the implementation, every where just concept is given with pre-built Authentication Service