Your master password should be at least 12 lowercase letters or five words. Why use small letters or words when you have been told (and forced) to use capital letters and symbols earlier? If you need to enter the password of a device on the on-screen keyboard (such as the phone's), each capital letter or symbol may require additional keystrokes. You can get the same security and save yourself a lot of frustration by making your very small password only 30% longer than if it were mixed case . In other words, a randomly generated 13-character little password, which can be entered with 13 keystrokes, is as secure as a 10-character mixed password, which may require many more.
Via Ricky Mondello ]:
This captures why the passwords generated by the iCloud keychain are dominated by lowercase letters; You may have to write them somewhere, once (but don't remember). I explain this in the conversation I gave on PasswordsCon 2018.
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