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gh-project-codeguard-rules/skills/software-security/rules/codeguard-0-privacy-data-protection.md
2025-11-30 08:48:30 +08:00

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---
description: Privacy & data protection (minimization, classification, encryption, rights, transparency)
languages:
- javascript
- matlab
- yaml
alwaysApply: false
---
rule_id: codeguard-0-privacy-data-protection
- Implement strong cryptography, enforce HTTPS with HSTS, enable certificate pinning,
and provide user privacy features to protect data and anonymity.
- Use strong, up-to-date cryptographic algorithms for data in transit and at rest; securely hash passwords with established libraries.
- Enforce HTTPS exclusively and implement HTTP Strict Transport Security (HSTS).
- Implement certificate pinning to prevent man-in-the-middle attacks even if CAs are compromised.
- Minimize IP address leakage by blocking third-party external content loading where feasible.
- Maintain transparency by informing users about privacy limitations and data handling policies.
- Implement privacy-focused audit trails and access logging.
- Return "Invalid username or password" to prevent account enumeration
- Use Argon2 or bcrypt with unique salts per user
- Store sessions server-side with cryptographically random IDs