Swiss company Proton, known for its privacy-focused online services, has developed its own Captcha service to distinguish between genuine login attempts and bots. The system is touted as the world's first "censorship-resistant" CAPTCHA. Proton's CAPTCHA, called Proton CAPTCHA, uses a multi-pronged approach that combines computational and visual challenges, adjusts difficulty levels based on user behavior, and includes interactive puzzles. It also ensures accessibility in countries with internet restrictions through alternative routing. Proton's goal was to provide a CAPTCHA system that prioritizes privacy, usability, accessibility, and security.

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