Extending authorization code flows with PKCE

Proof Key for Code Exchange (PKCE), pronounced "pixie", is a security mechanism used in OAuth 2.0 authorization code flows to mitigate risks associated with public clients, such as mobile or single-page applications, which cannot securely store secrets. PKCE works by employing dynamically generated secrets, introducing fields such as code_verifier and code_challenge, to ensure that the client completing an authorization process is the same one that initiated it. This mechanism is particularly crucial when using native deeplinks, as these can be spoofed to intercept authorization codes. PKCE enhances the security of various authentication flows, including password resets and magic links, by preventing token interception and ensuring secure client verification. Despite being initially designed for public apps, PKCE can also add an extra layer of security to private clients, and it is strongly recommended over the deprecated implicit flow due to its vulnerability to security breaches.

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