Re: [PHP] echo text - anti-spam-spider measure

On Wed, February 28, 2007 1:20 am, Stut wrote:
Of all the possible methods, entities are the easiest for bots to
handle. They just need to decode the entities.

More reliable methods involve using javascript to write out the
mailto:
tag. Do it in several statements. But even then, some of the smarter
spiders will execute simple javascript like that. You can make it
better
by using onload to execute the javascript which means the spider will
need to implement that, which I don't believe they do at the moment.

Of course the best way is to use an image and don't link it. If it's
just a way for visitors to contact you, use a contact form. You don't
expose the email address and can control it a lot better.

I'm no expert, but as far as I can tell from my readings on this
subject, the reality is that spammers just don't bother to harvest
them.

Ongoing studies, older studies, newer studies.

Everybody knows that the spammers *could* decode HEX or even the JS
fairly trivially, but they don't.

There are many theories [*] as to why that is, but the empirical
evidence is that the obfuscation is very effective at reducing spam
dramatically, no matter how silly that seems.

* Maybe it's too much low hanging fruit. Maybe they don't want to
risk hitting honey-pot emails. Maybe anybody smart enough to
obfustcate is too smart to fall for the stupid spam anyway. ...

--
Some people have a "gift" link here.
Know what I want?
I want you to buy a CD from some starving artist.
http://cdbaby.com/browse/from/lynch
Yeah, I get a buck. So?
.

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