---
url: 'https://www.corbado.com/faq/passkeys-prevent-credential-stuffing-reuse-attacks'
title: 'How do passkeys prevent credential stuffing & reuse attacks?'
description: 'Passkeys prevent credential stuffing and reuse attacks by using public-key cryptography, eliminating shared secrets, and binding credentials to specific services.'
lang: 'en'
---

# How do passkeys prevent credential stuffing & reuse attacks?

## How Do Passkeys Prevent Credential Stuffing & Reuse Attacks?

[Credential stuffing](https://www.corbado.com/glossary/credential-stuffing) and password reuse attacks
[exploit](https://www.corbado.com/glossary/exploit) stolen usernames and passwords from data breaches. Attackers
use automated tools to test these stolen credentials across multiple sites, capitalizing
on users who reuse passwords. Passkeys eliminate these risks by fundamentally changing how
authentication works.

### 1. Unique Credentials for Every Account

Unlike passwords, passkeys generate **a unique cryptographic key pair for each website or
application**. The private key remains securely stored on the user’s device, while the
public key is shared with the service. This means that:

- **Stolen passkeys from one site cannot be used on another**—there’s no credential reuse
  risk.
- **Credential stuffing becomes ineffective**, as there’s no shared secret for attackers
  to steal and test across multiple accounts.

### 2. No Shared Secrets or Passwords to Steal

Traditional passwords are stored on servers, making them **prime targets for data
breaches**. Passkeys, on the other hand:

- Do not transmit or store sensitive credentials on the server.
- Use **public-key cryptography**, meaning even if an attacker breaches a website’s
  database, they only obtain public keys—which are useless for authentication.

### 3. Protection Against Phishing and Automated Attacks

Since passkeys are **bound to the original website (relying party ID)**, they prevent
[phishing](https://www.corbado.com/glossary/phishing) attempts that trick users into entering credentials on fake
sites. Even if a user unknowingly visits a malicious page, their passkey won’t
authenticate the attacker’s site.

### 4. Stronger Multi-Device Security

Passkeys support **secure device-bound storage** and **cross-device authentication** via
cloud sync. Unlike passwords, users don’t need to manually type or reuse them across
different devices, reducing the risk of compromise.

## Conclusion

Passkeys effectively eliminate [credential stuffing](https://www.corbado.com/glossary/credential-stuffing) and
password reuse [vulnerabilities](https://www.corbado.com/glossary/vulnerability) by ensuring:

- **Each account has a unique, cryptographic credential.**
- **There are no shared secrets for attackers to exploit.**
- **Phishing sites and automated attacks fail to capture usable login data.**

By adopting passkeys, organizations can significantly **reduce account takeover risks**,
enhance security, and improve user experience without relying on traditional
password-based defenses.

## Read the full article