I remember when we implemented AAA (Authentication, authorization, and accounting) at Amazon, which enforces a central authority and secondary encryption on all

I remember when we implemented AAA (Authentication, authorization, and accounting) at Amazon, which enforces a central authority and secondary encryption on all inter-service communications. What was great about it was there was several services that simply refused to integrate and we had to let them have unfettered access to other services. To cover up this issue, we simply ignored it. Hasn't been a problem yet.