Re: [opensuse] Re: protecting online images

On Monday 28 December 2009 14:41:22 jdd-gmane wrote:
Le 28/12/2009 14:25, Felix Miata a écrit :
On 2009/12/28 08:48 (GMT+0100) jdd-gmane composed:
I try to protect some online images.

You can't. For a site visitor to see them the browser has to first fetch
them. Once fetched, there's no way to prevent saving locally. You can
make it more difficult for the clueless to do, but anyone with more than
nominal browsing experience will probably know or find a way around your
attempts.

I may not have been clear.

Visitor can and have to be allowed to save the displayed image.

But on a list of images, some are private, some public and the names
are mostly sequential, so one can change the name on the public URL
window and dl the private ones. for example

public:

image_100023.jpg

private

image_100027.jpg

it's pretty easy to try 23, 24, 25, 26 and find 27 (I already did this
myself on some circomstances :-)

I added on my generation script this:

(for I loop)

ran="-$RANDOM-" ;
rename "." "$ran." $I ;

like this the image names become

image_100023-1589-.jpg
image_100027-5376-.jpg

like this I still can identify the image, but the full name is much
more difficult to guess

I know it's not impossible to crack, given enough time, but will the
robots make such attempts??

I can randomize twice, but is this necessary (it takes time)?

thanks
jdd

--
http://www.dodin.net
http://valerie.dodin.org
http://news.opensuse.org/2009/04/13/people-of-opensuse-jean-daniel-dodin/

Do you store them in the same folder???
Why not protect the private ones with a stronger login?
Make a authenticated user account to use for the private ones.
And maybe encrypt them with gpg perhaps?
Only those with the right passkey can devrypt and view+


--

/Rikard Johnels

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