On Mon, Nov 25, 2002 at 04:37:14AM -0000, Frank Cheong wrote:
hi,
  This seems rather interesting. As you mentioned the reason for this could be coz of 
some kind of poisioning enroute. This could be very difficult to detect. One thing you 
can do is to find out from which ips these complaints arise. Try and find out if there 
is some rogue server in the ips route to your server. If that is the case then you can 
complain to the webmaster of that server. 
Moving to ssl as u mentioned is ok but with the cost of the overhead. I dont think it 
wld be advisable that for some images that are being changed you incur the additional 
cost.
hth
phani

> 
> 
> I got one serious question that is I received complains regarding one of 
> the image on my web site has been modified by a PORN picture ! While the 
> image have resumed normal during the second visit.
> 
> After receiving the complains, I have of course double checked the GIF 
> image's filesize and date timestamp found that it is completely normal. 
> Therefore, the image haven't been modified. So I do want to know what is 
> the possibilities in doing this ?
> (Like HTTP session hijack, proxy poisoning, someone doing man in the 
> middle etc) any other ways to do that ?
> 
> As these activities mostly happens outside my server boundry, I assume I 
> can't do anything with it, how about any outside parties ?
> 
> As I know going for SSL maybe one of the alternative to stop this but this 
> will add on extra processing on my website and it will make it slow. So I 
> don't want to go for it, any other way to secure against this ?
> 
> 

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