How PKCE Enhances Security in Authorization Code Flow
Proof Key for Code Exchange (PKCE) has become a critical enhancement to the OAuth 2.0 Authorization Code Flow, especially for public clients such as mobile and single-page applications. By adding a cryptographically secure verification step, PKCE significantly reduces risks like authorization code interception and replay attacks. What is PKCE and Why Was It Introduced? Originally designed for native and public clients unable to securely store a client secret, PKCE addresses a fundamental security gap in OAuth 2.0. It prevents attackers from stealing authorization codes and exchanging them for access tokens because the authorization code is bound to a one-time generated secret known only to the client. ...