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We considered this, but decided that people want to use muscle memory in order to quickly unlock their screens, rather than hunting for the correct digits in a randomized layout. This allows you to quickly go through the motions, and only adds one extra gesture.

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But security is the whole point isn't it? Seems to me that having them hunt for the correct digits is the right thing to do.

Not being annoyed every time you unlock the phone is often a higher priority. Especially when you have to opt in.

Security and usability are 2 orthogonal design choices.

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