Apple's two-factor authentication system sets up a chain of trust from one device to another. By ensuring your identity on one device, that device can then authenticate you on another device, and provide you with enhanced features, such as an Apple Watch unlocking a Mac, or an iPhone authorizing Apple Pay on a Mac. Understanding this chain of trust helps you better understand how Apple protects you.
Show Notes:

The Chain of Trust in Apple Devices (The Mac Security Blog)
Chain of trust (Wikipedia)
Episode 52: Was the Big Hack Really Big?
Certificate authority (Wikipedia)
Use Your Apple Watch to Unlock Your Mac and Authenticate
About the Apple T2 Security Chip


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