In the OAuth2 flow, how can I prevent token theft or forgery? For example, is adding PKCE sufficient, or are additional steps required? Is this a feasible approach for startups?
How to secure authentication with OAuth2?
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Recently, while doing a simple API integration for a startup, I was adding user login with OAuth2. I made sure the tokens were encrypted, but I realized they could be easily cracked! I added PKCE, which significantly reduced the risk of theft, especially in mobile apps. It's also quite feasible for startups—a small code change can significantly boost security.