On Tuesday, May 21, 2013 11:38:11 PM UTC+2, Nathanael Abbotts wrote:
>
> One quite severe issue that I can think of is that any secondary users on 
> a device have to know the "adminstrator's" password if they want to be able 
> to access the device from a powered off state. This is obviously less than 
> ideal. 
>

LUKS volumes can have several independent passwords that each unlock the 
same fs, so that shouldn't be an issue.

I guess the reasoning behind this policy is to reduce futile support 
inquiries by people who've forgotten the encryption password. Maybe even 
due to carrier or OEM pressure. However, I think it cripples the feature so 
much that it should still be changed. Hide it behind a big fat "don't come 
crying to us if you forget your password, there's nothing we can do" 
warning if you must, but at least make it possible.

In fact, I think it should be possible to combine a strong encryption 
passphrase with any screen unlock method, including pattern and slide. 
Don't assume that all users are stupid and don't know what risk they're 
trying to protect themselves from. E.g. in my case, I mostly care about 
offline attacks, when I know in advance that the device might fall into the 
hands of an adversary. Obviously I'd turn it off beforehand. However, with 
the current implementation, I simply don't use any encryption at all, 
because I'm not prepared to make the big usability sacrifices necessary for 
a level of security that's not just a joke.

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