"""
This module is reserved for future implementation of advanced cryptographic operations.

Current Fernet encryption helpers are implemented in `app.core.encryption`.
Login credentials are owned by Keycloak; this backend does not hash or store
local passwords.
Future expansion may include:
- Asymmetric encryption (RSA/ECC) for secure communication
- Key management and rotation services
- Integration with Hardware Security Modules (HSM)
- Digital signatures for data integrity verification
"""