See, when you log into Windows with Windows Hello the authority with which you authenticate against is determined by your join state. Tradeoffs.īetween the two, for the vast majority of customers Key Trust is a lot easier to deploy as they're already hybrid, or are planning it, don't already have PKI in place, and have no problem standing up a handful of 2016 servers.īut there are some downsides. This mode doesn't require PKI and gives you some flexibility in deployment, but for all intents and purposes requires The Cloud to do all sorts of orchestration plus enough Server 2016 DCs to handle authentication load. Okay, that actually makes for some reasonable tradeoffs.īut then we had this other mode: Key Trust. We cut out teeth on getting the infrastructure right with smart cards over 20 years.Īll of this came about in Windows 10, and didn't require changes to Active Directory, which means no Domain Controller deployments. This model works about as well as you can expect for a system that is not dependent on the cloud and must coexist with existing PKI within large organizations, and actually: it works well. Smart cards store them in silicon embedded on a plastic card. In the Hello case it's stored on disk and protected by your TPM.
Smart cards require the exact same infrastructure, and the only difference is where the private key is stored. This is a surprisingly accurate depiction because under the covers Windows Hello uses certificate logon to get you to the desktop, which in the CT case means spinning up PKI, deploying templates, protecting private keys through hardware binding, etc. In the early days, Windows Hello for Business came in two deployment flavors: Certificate Trust or Key Trust.Ĭertificate Trust is basically the answer to the question "what if we made smart cards unlockable with your face?" Twitter warning: Like all good things this is mostly correct, with a few details fuzzier than others for reasons: a) details are hard on twitter b) details are fudged for greater clarity c) maybe I'm just dumb. Windows Hello Cloud Trust: What is it? Why do you care?
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