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CPT Glossary

Authentication

Type
Description
What is CTAP?
CTAP (Client to Authenticator Protocol) lets external authenticators like phones and security keys communicate with a client device for FIDO2 login.
What is WebAuthn?
WebAuthn is the W3C web standard that lets websites offer passwordless, phishing-resistant login with passkeys and security keys. Learn how WebAuthn works.
What is FIDO2?
FIDO2 is the open standard behind passwordless, phishing-resistant authentication and passkeys, combining WebAuthn and CTAP. Learn how FIDO2 works.
What is credential stuffing?
Credential stuffing is an attack that uses stolen username-password pairs from one breach to break into accounts elsewhere, exploiting password reuse.
What are password alternatives?
Password alternatives are authentication methods that replace or reduce reliance on passwords, from passkeys to biometrics and magic links.
What is password fatigue?
Password fatigue is the exhaustion users feel managing too many passwords, leading to reuse and weak credentials.
What is call center (IVR) authentication?
Call center authentication verifies customers in the phone channel, historically with weak methods like KBA. Learn the risks and modern alternatives.
What is cross-channel (cross-device) authentication?
Cross-channel authentication gives customers a consistent, secure identity across web, mobile, and call center.
What is knowledge-based authentication (KBA)?
Knowledge-based authentication (KBA) verifies identity with personal questions like "your first pet." Learn why KBA is increasingly weak and what replaces it.
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