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Zero Knowledge Proofs vs. FIDO Based Authentications: A Comprehensive Comparison

In the world of online security, authentication methods are pivotal to maintaining privacy and integrity. Two prominent methods that have taken center stage in recent years are Zero Knowledge Proofs (ZKP) and Fast Identity Online (FIDO) based authentications. Both have their merits and demerits, but the distinction between the two can often be blurry. This blog aims to break down the advantages of ZKP over FIDO for authentication.

1. Enhanced Privacy with ZKP

  • Zero Knowledge Proofs (ZKP): With ZKP, the user can prove that they have certain information, such as a secret key, without revealing the information itself. The privacy of user information is paramount, as it ensures that no third party can gain access to the data.

  • FIDO Based Authentications: Although FIDO also prioritizes security, it often requires user information to be shared with relying parties, potentially putting privacy at risk.

2. Scalability and Flexibility

  • Zero Knowledge Proofs (ZKP): ZKP is versatile and can be implemented in various ways to suit different scenarios and security requirements. It's a method that can be scaled easily across different applications and industries.

  • FIDO Based Authentications: FIDO is more rigid in its approach and might not be as easily adaptable to different use-cases.

3. Passwordless Experience

  • Zero Knowledge Proofs (ZKP): ZKP enables passwordless authentication, reducing the risk of password-related breaches. It allows for a seamless and secure login experience.

  • FIDO Based Authentications: Although FIDO also promotes passwordless experiences, it's often tied to hardware-based solutions, which may limit accessibility.

4. Reduced Risk of Man-in-the-Middle Attacks

  • Zero Knowledge Proofs (ZKP): The nature of ZKP means that no sensitive information is transferred during the authentication process, making it difficult for attackers to intercept any usable data.

  • FIDO Based Authentications: While FIDO is robust against phishing and other common attacks, it can still be susceptible to specific man-in-the-middle attacks depending on implementation.

5. Universality and Interoperability

  • Zero Knowledge Proofs (ZKP): ZKP can be implemented across various platforms and does not rely on specific hardware or software configurations.

  • FIDO Based Authentications: FIDO often relies on hardware tokens, biometrics, or other specific devices, potentially limiting its use across all platforms.


Both Zero Knowledge Proofs and FIDO based authentications have shaped the way we approach online security. However, ZKP offers a more flexible, private, and universally applicable approach to authentication. By maintaining privacy without compromising security, ZKP fits well into a world that values both convenience and privacy.

At Infisign, we've harnessed the power of Zero Knowledge Proofs to provide robust and user-friendly IAM solutions that prioritize privacy and security. With offerings like SSO, Passwordless, and PAM capabilities, we strive to be at the forefront of innovation in this ever-changing digital landscape.

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