OAuth 2.0 PKCE Flow: Secure Mobile Authentication for SaaS

Mar 16, 2026
8 min read
OAuth 2.0 PKCE Flow: Secure Mobile Authentication for SaaS

Key Takeaways

  • PKCE eliminates the need for client secrets using dynamic code_verifier/code_challenge
  • Use system browsers (SFSafariViewController/Custom Tabs) to prevent phishing
  • Store tokens in Keychain (iOS) or Keystore (Android) for security
  • Generate 256+ bit entropy for code_verifier using crypto-secure randomness
  • Always validate state parameter to prevent CSRF attacks

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