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Date: Tue, 10 Apr 2012 08:33:42 -0700
From: Gage Bystrom <>
To: Erki Männiste <>, 
	"" <>
Subject: Re: keeping data safe offline

The best you could do without internet access to store the keys is to
implement a strong crypting method on the app itself and use every trick
you can that would piss off a reverse engineer.
On Apr 9, 2012 2:26 PM, "Erki Männiste" <> wrote:

> I am developing a software that is going to be distributed to end-users on
> usb sticks. The application and the content will be stored on that device
> and the content will be stored in a one-file sqlCE database, it will be
> crypted by default and will be encrypted by the application on-the-fly.
> My client has made it clear, that he wants to keep end-users from copying
> the content and using it on any other device but that very stick. Now, due
> to the offline requirement this is impossible to achive because i have to
> store the encryption key somewhere in the code and users are able to access
> the data while in unencrypted state.
> Can anybody recommend me any mechanism that i could apply, to make it more
> difficult for users to copy the content?
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