New Privacy-First CAPTCHA Defense Against Bots


Meet new Proton CAPTCHA from Proton AG, a custom-built CAPTCHA system designed to thwart bots and spammers.

Proton AG, a Swiss technology company known for its privacy-orientated products like ProtonMail and ProtonVPN, has unveiled an innovative solution that pledges to redefine online security. Meet Proton CAPTCHA, a custom-built CAPTCHA system.

CAPTCHAs, designed to thwart bots and spammers, are crucial for defending websites. However, Proton found existing options lacking, prompting the development of their own CAPTCHA system with a unique focus on privacy and accessibility.

Privacy Takes Center Stage

In a blog post, the company revealed that Proton CAPTCHA sets itself apart with a privacy-first approach, ensuring full GDPR compliance and eliminating reliance on external services. More importantly, it’s the world’s first CAPTCHA with censorship-resistant technologies, tailored to meet the unique needs of users in regions with restricted internet access.

Features that Set Proton CAPTCHA Apart

  • Multi-Layered Defense: Proton CAPTCHA employs a dual defence strategy. It combines visual challenges with computational proof of work, creating multiple barriers to deter attackers.
  • Adaptive Difficulty: The system adapts to suspicious behaviour. For instance, if a user struggles with visual CAPTCHAs, the computational proof of work becomes more challenging, slowing down potential bots.
  • Enhanced Accessibility: Users with visual impairments can still verify themselves through computational proof of work, offering an alternative to traditional CAPTCHAs.
  • Proof of Work: To protect against attacks, Proton CAPTCHA includes proof of work as an additional line of defence. This dissuades bots from exploiting the CAPTCHA system itself.
  • Variety of Challenges: Proton CAPTCHA introduces fun and engaging challenge types, making the CAPTCHA experience more enjoyable for users. Challenges include a beam alignment game and intuitive 2D puzzles.

Proton CAPTCHA has already been deployed to millions of users, completely replacing traditional CAPTCHAs for sign-up and login processes. According to the company, their goal is to continually refine CAPTCHA technology, reducing inconvenience for genuine users while making it increasingly formidable for attackers.

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