Security Concepts for Vibe Coding with Claude Code: Auth, Authorization, and Enforcement

A Reddit post from a software engineer with a decade of experience breaks down three core security concepts for developers vibe coding with Claude Code: authentication, authorization, and enforcement. The post uses a beach-side resort hotel metaphor to make the ideas stick.

The Three Security Concepts

• Authentication — the lobby check-in. Users prove who they are (e.g., username/password) and get a "room key" (a token or cookie). Every web app login page is this step.
• Authorization — what a valid user is allowed to do once inside. A guest's room key shouldn't open staff rooms or other guests' rooms. In web apps, this means distinguishing normal users from admins and preventing cross-user data access.
• Enforcement — actually applying these rules. The post warns: a common vibe-coding trap is a user asking for access to other users' data (like getting room key 102 when they only have room 101). The app must enforce that the authenticated user can only access their own resources.

"Just logging in (authentication) isn't enough. There will be functionality that some users should have and other users shouldn't. If this isn't given proper care and attention, users of your app could read and/or manipulate other users' data. Not good!"

How to Apply This to Your Vibe-Coded App

The post targets developers new to coding who are building apps with Claude Code. It suggests asking the AI agent to verify: "Who's allowed in? What are they allowed to do? Is it safe?" Specifically, prompt the agent to check for authorization rules on every API endpoint or data access path — not just the login flow.