Passwordless Authentication with Passkeys
Passwordless authentication with passkeys helps organizations reduce the risks linked to stolen, reused, or phished passwords.
Passkeys replace traditional passwords with cryptographic credentials stored on a user’s device. Instead of typing a password, users confirm their identity with a fingerprint, face scan, device PIN, or another approved method.
This page explains what passkeys are, how passwordless authentication works with passkeys, and where passkey authentication can offer the most value for businesses.
Read more about the journey towards passwordless
What is passwordless authentication with passkeys?
Passwordless authentication with passkeys allows users to log in without typing or storing a password.
A passkey uses public key cryptography: the public key is stored by the service, while the private key stays on the user’s device. During login, the device proves the user’s identity without exposing the private key or sharing a password.
This makes passkeys more resistant to phishing, credential theft, and password reuse.
Learn about a JIT Passwordless solution
What is Zero Standing Privilege?
Passkeys are digital credentials that are used to log in to an account without a password. A passkey is made of a public key and a private key. The public key is saved by the service or website, and the private key stays safely on the user’s device.
Passkeys work with a device and usually need a fingerprint, face scan, or PIN to unlock. They are based on public key cryptography and are not shared or typed during login.
In practice, a passkey lets users sign in with the device they already use, such as a phone, laptop, or security key. The user usually confirms the login with a fingerprint, face scan, or PIN.
Because the private key is not typed, reused, or shared with the website, passkeys reduce many of the risks linked to traditional passwords.
Understand Zero Standing Privileges: The New Imperative for PAM
What is Passwordless Authentication?
Passwordless authentication is a way to log in without entering a password. It uses something the user has, like a device with a passkey, or something the user is, like a fingerprint or face.
The system checks identity using cryptographic methods or biometric data instead of a stored password. This helps prevent common attacks like phishing and password theft.
Read more about how this leads you down The Path to Modern Privileged Access Management (PAM)
Passkeys vs Passwords
| Passwords | Passkeys |
| Can be guessed, reused, or stolen | Cannot be guessed or reused like passwords |
| Can be phished through fake websites | Can be phished through fake websites |
| Need to be remembered or stored | Are stored securely on the user’s device |
| Are stored securely on the user’s device | Are stored securely on the user’s device |
| Can be exposed in data breaches | The private key stays on the device |
| Create friction for users | Support faster login with biometrics or device PIN |
Benefits of Passwordless Authentication
1. Protection Against Phishing and Credential Theft
Passkeys protect users from phishing and credential theft because they are never typed or shared. The private key used to sign the login request stays inside the user’s device and cannot be stolen through fake websites or email links. This stops attackers from using the most common method of stealing passwords.
2. Elimination of Password Fatigue and Resets
Users do not have to remember or reset passwords when using passkeys. This removes the common problem of password fatigue, where people forget or reuse passwords across services. It also reduces the number of password reset requests, which can burden support teams.
Read more about our solution: Just-in-Time Privileged Access Management | PrivX PAM | SSH
3. Faster and Simpler User Login
Logging with passkeys takes less time and fewer steps. A user can unlock access by using a fingerprint, face scan, or a trusted device. There is no need to enter or confirm passwords. This makes the login process faster and easier without lowering security.
4. Stronger Alignment with Zero Trust Models
Passkeys support Zero Trust models by removing the need for standing credentials. Since each login request is verified through a cryptographic challenge, identity is confirmed every time. This fits the Zero Trust principle that no user or device should be trusted without verification.
5. Compliance with Security Standards and Regulations
Passkey-based authentication helps meet compliance requirements under frameworks like NIST, GDPR, and others. These standards prefer methods that avoid static passwords and reduce the chance of data breaches. Passkeys meet this requirement by offering secure identity proof without exposing secrets.
6. Better Protection for High-Risk Access
Passkeys can be especially useful for high-risk access, such as administrator accounts, remote access, cloud access, and privileged access workflows.
Because passkeys reduce reliance on shared or reusable credentials, they can help organizations strengthen access security for users who connect to sensitive systems.
To explore more on this topic, see Advantages of Passwordless Authentication for Businesses.
How Passwordless Authentication Works with Passkeys
1. Public and Private Key Cryptography Explained
Passkeys are based on a cryptographic system called public key cryptography. This system uses two keys that are linked but not the same. One key is called the public key, and the other is the private key. The public key is shared with the server or application. The private key stays safe inside the user’s device.
When a person wants to log in, the server sends a request. The user’s device uses the private key to answer this request. The server checks if the answer matches the public key. If it does, access is granted. This proves the identity of the user without sending or storing any passwords. The private key never leaves the device and is not exposed during the process.
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2. Device-Based Storage and Biometric Confirmation
The private key in a passkey is stored inside the user’s personal device. This storage is handled by secure hardware parts like the Trusted Platform Module or Secure Enclave. These protect the private key from being copied or accessed by other software.
To use the private key, the user must confirm identity through a method like a fingerprint, a face scan, or a device PIN. This step is called biometric confirmation. It ensures that even if someone else gets the device, they cannot use the passkey without passing this check. The combination of secure storage and biometric checks makes passkeys both safe and easy to use.
3. FIDO2 and WebAuthn Protocols Behind the Flow
FIDO2 and WebAuthn are two protocols that make passkeys work across different browsers and systems. FIDO2 defines how devices should store keys and confirm identity. WebAuthn is the part that works with browsers and websites to carry out the login process.
When a user signs up or registers a passkey, the system uses these protocols to create and store the public key and private key securely. During login, the server uses WebAuthn to talk to the device, which then uses FIDO2 to handle the key operations.
This setup allows passkeys to be used on different devices, systems, and applications without needing a separate password for each one.
4. Challenge–Response Mechanism in Action
When a user tries to log in, the server creates a one-time challenge. This is a short string of random data. The user’s device takes this challenge and signs it using the private key. This signed message is sent back to the server.
The server checks the signature using the public key it already has. If the signature is correct, it proves the user has the right private key without ever showing it. This process is called challenge-response. It is secure because the challenge cannot be reused, and the private key stays hidden during the entire process.
To learn how this process can be applied in real systems, see How to Implement Passwordless Authentication in Your Organization with SSH Communications Security.
When Should Organizations Use Passkeys?
Organizations should consider passkeys when they want to reduce password-related risks and improve login security without adding unnecessary friction for users.
Passkeys are especially useful for:
- remote workers
- cloud applications
- privileged users
- administrators and developers
- customer-facing applications
- employees using multiple devices
- high-risk access workflows
- zero trust access models
Authentication Use Cases Where Passkeys Offer the Most Value
1. Cloud and Remote Access Management
Passkeys are useful for cloud and remote access because they allow users to log in from anywhere without needing to type or manage passwords. This makes it easier and safer to access cloud platforms and services using a trusted device.
The private key stays on the device and cannot be stolen through phishing or copied through remote attacks.
In remote access setups, passkeys help verify the identity of the user and the device. This ensures that only trusted users with approved devices can connect to cloud systems. It also reduces the risk of stolen credentials being used from unknown locations.
2. Privileged Access for Admins and Developers
Admins and developers often have access to sensitive systems. Using passkeys helps limit the risk of password misuse or theft. When passkeys are used, each authentication is verified using a private key that is stored safely in the user’s device.
This method supports role-based controls and reduces the attack surface. Even if someone tries to target a high-level account, they cannot log in without the correct device and biometric confirmation. This improves security for critical systems and data.
3. End-User Authentication Across Devices
Passkeys allow end users to log in across different devices without creating new passwords for each one. When the same passkey is available through a synced account or secure transfer method, users can access services on phones, laptops, or desktops using the same secure method.
This makes it easier to manage access in organizations where people use more than one device. It also keeps login consistent and secure across platforms without depending on password reuse.
4. Zero Trust and High-Risk Access
Passkeys can support Zero Trust access by verifying the user and device during login. Since authentication is based on cryptographic proof rather than a reusable password, organizations can reduce the risk of stolen credentials being used to access sensitive systems.
This is especially useful for high-risk access workflows where additional identity assurance is needed.
Passkey Implementation Checklist
Before implementing passwordless authentication with passkeys, organizations should consider:
- which users or groups should start with passkeys
- which applications and systems support passkey authentication
- how passkeys will work across devices
- what recovery process will be used if a device is lost
- how passkeys fit with MFA and existing identity systems
- how to support privileged users and administrators
- how to train users on the new login experience
- how to monitor adoption and security outcomes
Support Passwordless Access with SSH Solutions
SSH solutions help organizations strengthen access security by supporting passwordless and keyless authentication models across IT, cloud, and operational environments.
PrivX supports just in time access, Zero Trust principles, and passkey-based authentication methods to help reduce reliance on static credentials. Universal SSH Key Manager helps organizations discover and manage SSH keys as part of a broader move toward passwordless access.
Together, these capabilities can help organizations reduce credential risk while maintaining secure access to critical systems.
FAQ
What are passkeys?
Passkeys are digital credentials that allow users to log in without a password. They use public key cryptography, where the public key is stored by the service and the private key stays on the user’s device.
The user usually unlocks the passkey with a fingerprint, face scan, device PIN, or security key.
How does passwordless authentication with passkeys work?
Passwordless authentication with passkeys works by replacing the password with a cryptographic login process.
When a user logs in, the service sends a challenge to the user’s device. The device signs the challenge with the private key, and the service verifies it using the public key. The password is never typed, stored, or sent.
Are passkeys more secure than passwords?
Yes. Passkeys are more secure than traditional passwords because they are not reused, typed, or shared with websites.
They are also resistant to phishing because a fake website cannot use the passkey to authenticate to the real service.
Are passkeys the same as biometrics?
No. Biometrics and passkeys are not the same thing.
A passkey is the cryptographic credential used for authentication. Biometrics, such as a fingerprint or face scan, are usually used to unlock the device so the passkey can be used.
Can passkeys be used across multiple devices?
Yes, passkeys can often be used across multiple devices, depending on the platform and how passkey syncing is configured.
Organizations should plan how users will access passkeys from phones, laptops, tablets, or security keys, especially for business-critical systems.
Why are passkeys phishing-resistant?
Passkeys are phishing-resistant because the private key never leaves the user’s device and is not typed into a website.
Even if a user visits a fake login page, the attacker cannot capture a reusable password because there is no password to steal.
How can organizations implement passkeys?
Organizations can implement passkeys by identifying which applications support passkey authentication, choosing pilot user groups, planning recovery processes, and integrating passkeys with existing identity and access workflows.
For business use, it is also important to consider privileged users, remote access, device management, and user training.
