Posts tagged “authentication”
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What WebAuthn signCount tells you: the counter check and clone signals
Per WebAuthn Level 3: what signCount counts, when it stays at zero, the exact comparison an RP runs, why a lower or equal value is a signal rather than proof, and how the BE and BS flags relate.
OAuth 2.0 PKCE: Making an Intercepted Authorization Code Useless
How PKCE's code_verifier and code_challenge stop authorization code interception: S256 math, server checks, why plain and downgrades fail, where state matters, and what PKCE does not cover.
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