By Adrian Lane (https://securosis.com/blog/author-posts/239) (guest author)
This blog first appeared on Securosis (https://securosis.com/blog/multi-cloud-key-management-new-series)
Running IT systems atop public cloud services is a reality for most companies. Just about every company uses Software-as-a-Service to some degree, with many having already migrated back office systems like email, collaboration, file storage and customer relationship management software. But now we are also witnessing the core of the data center – financial systems, databases, supply chain and enterprise resource planning software – moved to public Platform and Infrastructure ‘as-a-Service’ (PaaS, IaaS) providers. It’s common for medium and large enterprises to run SaaS, PaaS and IaaS from different providers, in parallel with on-premise systems. Some small firms we speak with no longer have a data-center, with all of their applications hosted by third parties.