Introducing FeynAuth: A Zero-Knowledge Password Manager Built for the Privacy-First Era
Your passwords belong to you. Not us. Not anyone else. Just you.
We're thrilled to announce that FeynAuth is launching soon—a password manager designed from the ground up with one uncompromising principle: we can never see your passwords, and neither can anyone else.
In a world where data breaches make headlines weekly and trust in digital services erodes by the day, we asked ourselves a simple question: What if a password manager was built so that even its own creators couldn't access your data?
The answer is FeynAuth.
The Problem with Traditional Password Managers
Let's be honest about the current landscape. Most password managers ask you to trust them with your most sensitive data. They encrypt your vault, sure—but the architecture often means that somewhere, somehow, they could access your information if compelled by legal pressure, compromised by attackers, or tempted by bad actors within the organization.
We've seen major password managers suffer breaches. We've seen encrypted vaults exfiltrated. We've watched users scramble to change hundreds of passwords because a service they trusted wasn't as secure as promised.
This isn't a criticism of those teams—security is genuinely hard. But we believe the architecture itself needs to change.
What Makes FeynAuth Different?
True Zero-Knowledge Architecture
Zero-knowledge isn't a marketing term for us—it's the engineering foundation of everything we build.
When you create your master password in FeynAuth, cryptographic keys are derived entirely on your device. Your actual password never leaves your machine. What reaches our servers is mathematically useless without the key that exists only in your possession.
This means:
- We cannot decrypt your vault. Ever. Even if we wanted to.
- A server breach exposes nothing useful. Attackers would get encrypted blobs that are computationally infeasible to crack.
- Legal compulsion hits a wall. We can't hand over what we don't have.
Built on Rust's Security Guarantees
The cryptographic core of FeynAuth is written in Rust—a language designed to eliminate entire categories of security vulnerabilities at compile time. Memory safety bugs, buffer overflows, and use-after-free vulnerabilities that plague C/C++ codebases? Rust prevents them by design.
Our crypto module handles:
- Key derivation using industry-standard algorithms
- AES-256-GCM encryption for vault contents
- Secure random number generation
- Constant-time operations to prevent timing attacks
This isn't security through obscurity. It's security through mathematical certainty and battle-tested cryptographic primitives.
Seamless Browser Integration
Security means nothing if it's too inconvenient to use. FeynAuth ships with a browser extension that integrates naturally into your workflow:
- Auto-fill that actually works—across login forms, registration pages, and multi-step authentication flows
- Password generation with configurable complexity right where you need it
- Vault access without leaving your current tab
- Secure notes for sensitive information beyond passwords
Why We Built This
The founding team behind FeynAuth has watched the password management space with growing concern. Services we personally used and recommended have had security incidents. The fundamental trust model felt broken.
We wanted something we could use ourselves with complete confidence. Something we could recommend to family members who aren't technical. Something that wouldn't keep us up at night wondering "what if."
FeynAuth is that something.
What's Coming at Launch
The initial release will include:
- Browser extension for Chrome-based browsers (Firefox and Safari to follow)
- Unlimited password storage in your encrypted vault
- Password generator with customizable rules
- Secure notes for sensitive non-password data
- Cross-device sync through encrypted cloud storage
- Import tools for migrating from other password managers
Our Commitment to You
Open cryptography. Our encryption approach uses well-documented, peer-reviewed algorithms. No proprietary "secret sauce" that might hide weaknesses.
Transparent development. We'll be publishing technical deep-dives on our security architecture, and we're working toward an independent security audit before launch.
Privacy by design. We collect the minimum data necessary to provide the service. Your email for account recovery. Encrypted blobs for sync. That's it.
No ads. No tracking. No data sales. Our business model is simple: we provide a valuable service, and users who find value in it pay for it. Your data is not our product.
Join the Waitlist
FeynAuth is entering final testing before public launch. If you want to be among the first to experience password management that puts privacy first:
Early supporters will receive:
- Priority access to the beta
- Founding member pricing (locked in for life)
- Direct input on feature priorities
- Our eternal gratitude
FeynAuth. Passwords you own. Privacy you control. Security you can verify.
Coming Soon.