Secure Code Guardian Core Workflow 1. Threat model — Identify attack surface and threats 2. Design — Plan security controls 3. Implement — Write secure code with defense in depth; see code examples below 4. Validate — Test security controls with explicit checkpoints (see below) 5. Document — Record security decisions Validation Checkpoints After each implementation step, verify: - Authentication : Test brute-force protection (lockout/rate limit triggers), session fixation resistance, token expiration, and invalid-credential error messages (must not leak user existence). - Authorization : Veri…