From InfoWorld: Apple may not be the first name that comes up when you think about security, but iOS 9 shows the company has mobile security squarely in mind.
The latest Apple security push began in 2013 with Touch ID, the fingerprint recognition sensor built into the iPhone 5S. Then Apple encrypted phones by default and expanded its encryption strategy in iOS 8. With iOS 9, Apple tackles two common issues with iDevices: data stolen from lost or stolen devices, and the security of Apple ID and iCloud accounts.
Apple set up a new two-factor authentication system and updated its passcode requirements for iOS 9. These changes make it harder for someone else to access or steal user data stored on iPhones and iPads.
It seems like a minor change, but Apple changing its passcode requirements to six digits instead of the more common four digits significantly boosts security for iOS 9 devices.
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