This document, "Set up iCloud Keychain" https://support.apple.com/en-us/HT204085 contains this statement, "create an iCloud Security Code—six digits, complex alphanumerics, or randomly generated". Is six digits the design limit? Can a more complex iCloud Security Code be set? Thx! P.S. This forum is way better than Stack Overflow!

Many thx to Garrett Davidson for his exceptional WWDC2022 presentation: https://developer.apple.com/videos/play/wwdc2022/10092/ Basic question, how is the the private key for a passkey stored on a local device (let's say within the Edge or Chrome browser)? Is it in an encrypted cookie? If so, how is the local encryption done?