# Digital Chaukidar - Security Audit & Verification Report

**Audit Date**: 2026-08-11  
**Security Standard**: OWASP Mobile Top 10 + OWASP API Top 10 + Android Platform Security Guidelines  

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## 1. Authentication & Session Security
- **JWT & Token Family Rotation**: Refresh tokens use family IDs (`token_family`) and cryptographic SHA-256 JTI hashing. If a used refresh token is replayed, the entire token family is revoked immediately to mitigate token hijacking.
- **Biometric Authentication**: Device biometric challenges utilize server-issued nonces preventing replay attacks.
- **Admin Two-Factor Authentication (2FA)**: Time-based One-Time Password (TOTP) with encrypted recovery codes and rate-limited verification attempts.

## 2. Authorization & IDOR Protections
- **Device & Data Isolation**: All API queries enforce strict tenant separation by constraining queries on authenticated `user_id` and verified `device_id` ownership.
- **Remote Command Authorization**: Commands require cryptographic request verification and admin/user authorization policies before execution.

## 3. Cryptographic Nonce & API Idempotency
- **Idempotency Keys**: Critical financial and activation operations utilize `api_idempotency_keys` with database locking to prevent duplicate billing or double redemption.
- **Request Nonces**: Nonces are stored with TTL expiry in `api_request_nonces` ensuring security signals cannot be spoofed through network interception.

## 4. Input Validation & Data Sanitization
- **Strict Validation Rules**: All incoming controller requests pass through strict Laravel Request Form classes validating types, regex patterns, coordinates, and UUID formats.
- **SQL Injection & XSS Guard**: Eloquent ORM parameterized queries and Blade automatic HTML escaping ensure zero injection vulnerabilities.