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From: George Petasis <petas...@yahoo.gr>
Newsgroups: comp.lang.tcl
Subject: Re: Encrypt a text file?
Date: Sat, 06 Oct 2012 13:34:56 +0300
Organization: National Technical University of Athens, Greece
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Dear Christian,

The user of the product is a computer engineer. Just opening it in a 
text editor, the fact that it is a zip file will show. And then it will 
be easy to get the contents.

The text files contain an electronic dictionary, and I want to protect this.

George

Στις 6/10/2012 12:38 μμ, ο/η Christian Gollwitzer Î­Î³Ï Î±ÏˆÎµ:
> Hi George,
>
>
> Am 06.10.12 09:53, schrieb George Petasis:
>> I have a small product in tcl, and I want to somehow "obfuscate" the
>> data files it uses (txt files). For the tcl code I am going to use
>> ActiveState's TDK.
>>
>> Is there an extension that will allow me to obfuscate/encrypt a text
>> file?
>>
>
> why do you want to obfuscate the data files? Is it only to keep a casual
> user from inspecting it, or do you want to achieve some security?
>
> If the first case, I recommend the approach used by OO, Word and many
> other commercial packages: Create a zip file, e.g. using
>
> http://wiki.tcl.tk/15158
>
> and just store it with a file name other than .zip. This has the big
> advantage, that on request from the users, you can simply unzip this
> file and inspect it without any hassle.
>
> ZIP also supports simple encryption, but this is not handled by the code
> on the wiki. The additional benefit of ZIP is that you can store more
> complex documents as logical folders.
>
>      Christian
>
> PS: Last time I checked, mkzip on the wiki had some bug that prevented
> file names with spaces. I should check the patched version in our
> commercial software to update the wiki