advancedOAuth2 & OpenID Connect Deep Dive
What is PKCE, and why do mobile apps and SPAs need it?
PKCE (Proof Key for Code Exchange) replaces the need for a static client_secret — which can't be safely embedded in a public client like a mobile app or JS bundle without being extractable — with a dynamically generated, per-attempt secret (the code_verifier/code_challenge pair). This ensures that even if an authorization code is intercepted, an attacker cannot complete the token exchange without also knowing the original verifier.
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