I would imagine there is some slowdown as the server is doing more work than
it would otherwise do. However I just created a test page with 5 unique
images on it all called in this way, and it was processed in 0ms, so the
processor hit can't be huge.
--
James Smith
[EMAIL PROTECTED]
----- Original Message -----
From: "Jake Hileman" <[EMAIL PROTECTED]>
To: "CF-Talk" <[EMAIL PROTECTED]>
Sent: Sunday, October 01, 2000 4:35 PM
Subject: Re: Protecting Content / content leeching... A CF method?
> Does doing this part of what you said:
> "> <img
> >
>
src="picture.cfm?picture=#URLEncodedFormat(encrypt('C:\WINNT\Help\iis\htm\tu
> > torial\rock.jpg', mykey))#">"
>
> slow down things considerably? Using the encrypt and then using the
decrypt
> later.
>
> Thanks,
>
> Jake
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> DivineWEB - Web Hosting
> Cold Fusion / ASP / mySQL
> Http://www.divineweb.com
> Design: http://www.18go.com
>
> ----- Original Message -----
> From: "James Smith" <[EMAIL PROTECTED]>
> To: "CF-Talk" <[EMAIL PROTECTED]>
> Sent: Sunday, October 01, 2000 9:23 AM
> Subject: Re: Protecting Content / content leeching... A CF method?
>
>
> > To expand on this a little further, you could use the following code...
> >
> > index.cfm
> > --------------------
> > <cffile action="READ"
> > file="c:\key.txt"
> > variable="mykey">
> > <img
> >
>
src="picture.cfm?picture=#URLEncodedFormat(encrypt('C:\WINNT\Help\iis\htm\tu
> > torial\rock.jpg', mykey))#">
> >
> > picture.cfm
> > --------------------
> > <cffile action="READ"
> > file="c:\key.txt"
> > variable="mykey">
> > <cfset image = #decrypt(picture, mykey)#>
> > <cfset imagetype = iif(listlast(picture, '.') EQ 'gif',
de('image/gif'),
> > de('image/jpeg'))>
> > <cfcontent file="#image#" type="#imagetype#">
> >
> > key.txt
> > --------------------
> > anythingyoulikeasanencryptionkey
> >
> > As you can see in this example the encryption key is stored in a file
> called
> > key.txt but could just as easily come from a database, either way you
can
> > change it with ease. You could even set up a scheduled task to
randomise
> > the key on an hourly basis if you wanted (depending on just how secure
you
> > want it).
> >
> > The file name is also URLEncoded to avoid html characters from messing
up
> > the string.
> >
> > If you are running NT4 you probably have the image I used as an example
on
> > your system, and it is not in the web servers path anywhere, yet will
> > display correctly. You will also be able to see (by viewing source)
that
> > the chance of anyone guessing a correct sequence is remote at best.
Using
> > "anythingyoulikeasanencryptionkey" as the key the img tag becomes...
> >
> > <img
> >
>
src="picture.cfm?picture=G6%205OOB%29RHZN%5B5%3FOPH%5E%5C%26E%5BF%2AITD1P%2D
> > N2BZ%29%257A%2A%23N%28WP%3D8%3EW6%3AF%3B%0A">
> >
> > and if that isn't secure enough for you, then nothing is!
> >
> > The supplied code will work fine for .gif, .jpg and .jpeg images, but
you
> > will have to modify it slightly if you use png or other formats.
> >
> > Have fun.
> >
> > --
> > James Smith
> > [EMAIL PROTECTED]
> >
> >
>
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