this post was submitted on 28 Jan 2025
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Attackers explain how an anti-spam defense became an AI weapon.

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[–] [email protected] 6 points 1 week ago (8 children)

Just make a custom 404 page that returns 13 MBs of junk along with status code 200

How would you go about doing this part? Asking for a friend who’s an idiot, totally not for me.

[–] [email protected] 7 points 1 week ago* (last edited 1 week ago) (7 children)

I use Apache2 and PHP, here's what I did:

in .htaccess you can set ErrorDocument 404 /error-hole.php https://httpd.apache.org/docs/2.4/custom-error.html

in error-hole.php,

<?php
http_response_code(200);
?>
<p>*paste a string that is 13 megabytes long*</p>

For the string, I used dd to generate 13 MBs of noise from /dev/urandom and then I converted that to base64 so it would paste into error-hole.php

You should probably hide some invisible dead links around your website as honeypots for the bots that normal users can't see.

[–] [email protected] 2 points 1 week ago (4 children)

How does this affect a genuine user who experiences a 404 on your site?

[–] [email protected] 1 points 1 week ago

They will see a long string of base64 that takes a quarter of a second longer to load then a regular page. If it's important to you, you can make the base64 string invisible and add some HTML to make it appear as a normal 404 page.

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