Web Authentication Levels

Full Title

Web Authentication Level 2 enables the creation and use of strong, attested, scoped, public key cred by web applications for strongly authenticating users.

Context

• This is designed for web applications, not native applications.
• The current draft of the evolving standard is available here.

Glossary

• Authenticator protects public key credentials, and interact with user agents to implement the Web Authentication API. Implementing compliant authenticators is possible in software executing (a) on a general-purpose computing device, (b) on an on-device Secure Execution Environment, Trusted Platform Module (TPM), or a Secure Element (SE), or (c) off device. Authenticators being implemented on device are called platform authenticators. Authenticators being implemented off device (roaming authenticators) can be accessed over a transport method.

Normal Flow

Web Authentication API Section 5

• Registration

1. Challenge, user info, RP info
2. RP ID, client data hash
3. User verification, new key pair

• Authentication

1. Challenge
2. RP ID, client data hash
3. User verification