> From: Mike Small [mailto:[email protected]]
> Sent: Sunday, April 20, 2014 11:20 AM
> 
> How do you examine closed source crypto?

Actually, here's a real good point:  I did /not/ read the Truecrypt or Keepass 
source, in order to determine their strengths and weaknesses.  I know from 
documentation and the interface, what standard crypto libraries they're using, 
what sources of random they are using, and how strong it all is.  I know 
they're storing ciphertext on disk, and the weakpoint of Truecrypt is the 
password.

I know the weakpoint in dropbox is the password.  They are using AES 256 
encryption at rest, which is strong, except for the fact that they know your 
password and therefore you have security *only* to the extent that all of their 
employees want you to, and haven't been hacked or coerced by the government, 
don't have any disgruntled former employees, etc.

I'm a fan of this "never give your password to anyone" idea.  As described in 
the "Good and Bad Crypto" thread.
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