linux-kernel - A FOSS Optical Illusion Captcha Algorithm for the Linux Kernel Mailing Lists.

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Message-ID: <CALZ+hkMsavWPaJ4b2WOZi+aZ2CD0Og8Uq9VoHz1QA3n2_cPkdA@mail.gmail.com>
Date: Mon, 28 Apr 2025 13:05:35 -0400
From: Vitalii <skikunvitalii07@...il.com>
To: linux-kernel@...r.kernel.org
Subject: A FOSS Optical Illusion Captcha Algorithm for the Linux Kernel
 Mailing Lists.

The Linux Kernel Mailing Lists need protection against denial of
service attacks and malicious code patch submissions made almost
effortless by machine learning algorithms.

By asking visitors to correctly say which direction of say, four (up,
down, left or right) a part of a captcha appears to be "moving", it
filters out the bots while allowing humans with optical illusion
fooled eyeballs to pass the test. Given 16 of those captcha requests
in a row and given that there are 2^2 choices per captcha, there is a
2^16*2 - 1 possible ways to enter 16 captchas wrong, but only 1 way to
enter them right, leading to a filtration failure of around 1 in 4
billion.