If you use Touch ID, its a change youll hardly notice.
But with one million possible combinations instead of 10,000 your passcode will be a lot tougher to crack.
iOS 8 run devices are capable of gear encoding authorized by the passcode.
Rather than the company, the encoding keys are actually put in the hands of Apples customers.
Below are the key features of the next iOS update:
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source: www.techworm.net