Module 10 · WebAuthn & Passkeys for APIs

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
Apr 27, 2026
2 min read
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Last updated: April 29, 2026

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Why this module. Phishing-resistant auth is the only auth that holds up against modern proxy-phishing attacks (EvilGinx and similar). WebAuthn / Passkeys are the standard. Apple, Google, Microsoft all default-support; Indian banks are following.

Why this module. Phishing-resistant auth is the only auth that holds up against modern proxy-phishing attacks (EvilGinx and similar). WebAuthn / Passkeys are the standard. Apple, Google, Microsoft all default-support; Indian banks are following.

Why TOTP isn’t enough anymore

EvilGinx-style proxy phishing intercepts the TOTP at login time. User enters TOTP on phishing page → attacker forwards to real site → real site issues session → attacker captures session. TOTP doesn’t help.

WebAuthn / Passkeys: cryptographic challenge tied to the legitimate origin. The phishing site can’t replay because the challenge is bound to the URL.

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