Guide to iOS estimated passcode cracking times (assumes random decimal passcode + an exploit that breaks SEP throttling): 4 digits: ~13min worst (~6.5avg) 6 digits: ~22.2hrs worst (~11.1avg) 8 digits: ~92.5days worst (~46avg) 10 digits: ~9259days worst (~4629avg)
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So the question now is: for a given level of security, which of these interfaces is easier for *you* to operate quickly. Which type of passcode is easier for you memorize?
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Alphanumeric has two hypothetical advantages. If you pick the password *truly at random* you can get more entropy (strength) from each alpha button press, so your password could be shorter. But those fewer keystrokes come at the cost of squinting at small keys.
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But of course we all know that none of you are picking your alphanumeric passcode at random. You’re all using Kitty123.
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In all seriousness, if you’re using the alphanumeric option to pick a *non-random* passcode (as most people do) then it’s much harder to tell how much password strength you’re getting. Some, a lot. Some less than they think.
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In practice (given the apparent limitations of current iOS attacks) it’s probably fine to use an alphanumeric passcode. It may be very secure. The real question is whether it’s worth the hassle of using the non-numeric keypad.
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So in summary: random (long) numeric passcodes may be a more ergonomic choice for a given security level, especially if you force yourself to memorize the thing over a week or two (even if that involves carrying a post-it during that time.) But do whatever works for you.
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Which you can probably accomplish as it is now, if you select alphanumeric and simply give it a bunch of numbers. (Which is probably really stupid.)
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Probably this is me just being an idiot, but…I feel like having it display two different keyboards is a sort of information leak. If an alphanumeric keypad was always displayed, it'd be harder for someone to know that your passcode was entirely numeric to begin with.
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