You can totally use emojis as passwords. You can probably even make this a policy at your company.
Edit: I thought this was an obvious enough joke, but just to clear things up: Only do this if you hate your company and everyone working there.
this post was submitted on 01 Oct 2023
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I use only special characters that are on the same places with most layouts (at least english and finnish). I suppose passwords with ä or ö might be a bit more resistant to brute-force attacks, but it causes far more problems than it might theoretically solve.
Longer passwords make your passwords exponentially more secure, in terms of security bits. Length matters.
True, and for most credentials I of course use password manager, but things like workstation password are still something I need to manually type out and for those 65 random characters aren't really practical. And for those I use things like 'HorseBattery69+' instead of 'SalainenSäläsänä69+' since while they (could be) equally long and complex the latter is pretty much impossible to type out if keyboard setting is something else than finnish (swedish works too I think).
ö and ä can be risky because there are multiple ways in which they can be encoded. ä can either be the backwards compatible "a with umlaut" or it can be "a" + joiner + "diaeresis". Software is supposed to normalise this, but it you've ever used a non-Latin character in your Windows username you'll realise how little software actually bothers to normalise input.
That means you can run into things like "if I enter my password on my PC it works, but if I enter it on my phone it doesn't, unless I use this specific keyboard app".
also nothing that looks the same for the annoying time when you do have to do some analog copying
no I, l, or | and i usually avoid ‘, “, !, /, \ (which one was it again?) and a few others that i have set in my password manager